Molten-Tail Masticore

At the beginning of your upkeep, sacrifice this creature unless you discard a card.
{4}, Exile a creature card from your graveyard: This creature deals 4 damage to any target.
{2}: Regenerate this creature.

Fellwar Stone

{T}: Add one mana of any color that a land an opponent controls could produce.

Deprive

As an additional cost to cast this spell, return a land you control to its owner's hand.
Counter target spell.

Rotting Giant

Whenever this creature attacks or blocks, sacrifice it unless you exile a card from your graveyard.

Arcane Signet

{T}: Add one mana of any color in your commander's color identity.

Divert Disaster

Counter target spell unless its controller pays {2}. If they do, you create a Lander token. (It's an artifact with "{2}, {T}, Sacrifice this token: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.")

Evil Eye of Orms-by-Gore

Non-Eye creatures you control can't attack.
This creature can't be blocked except by Walls.

Pit Spawn

First strike
At the beginning of your upkeep, sacrifice this creature unless you pay {B}{B}.
Whenever this creature deals damage to a creature, exile that creature.

Disruptive Student

{T}: Counter target spell unless its controller pays {1}.

Dismiss

Manta Ray

This creature can't attack unless defending player controls an Island.
This creature can't be blocked except by blue creatures.
When you control no Islands, sacrifice this creature.

Slipstream Serpent

This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.
Morph {5}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Rust Elemental

Flying
At the beginning of your upkeep, sacrifice another artifact. If you can't, tap this creature and you lose 4 life.

Choked Estuary

As this land enters, you may reveal an Island or Swamp card from your hand. If you don't, this land enters tapped.
{T}: Add {U} or {B}.

Wayfarer's Bauble

{2}, {T}, Sacrifice this artifact: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Wretched Anurid

Whenever another creature enters, you lose 1 life.

Darkwater Catacombs

Sky Diamond

This artifact enters tapped.
{T}: Add {U}.

Brackwater Elemental

When this creature attacks or blocks, sacrifice it at the beginning of the next end step.
Unearth {2}{U} ({2}{U}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Waterspout Djinn

Flying
At the beginning of your upkeep, sacrifice this creature unless you return an untapped Island you control to its owner's hand.

Kukemssa Serpent

This creature can't attack unless defending player controls an Island.
{U}, Sacrifice an Island: Target land an opponent controls becomes an Island until end of turn.
When you control no Islands, sacrifice this creature.

Swamp

Stenchskipper

Flying
At the beginning of the end step, if you control no Goblins, sacrifice this creature.

Jon Irenicus, Shattered One

At the beginning of your end step, target opponent gains control of up to one target creature you control. Put two +1/+1 counters on it and tap it. It's goaded for the rest of the game and it gains "This creature can't be sacrificed." (It attacks each combat if able and attacks a player other than you if able.)
Whenever a creature you own but don't control attacks, you draw a card.

Talisman of Dominance

{T}: Add {C}.
{T}: Add {U} or {B}. This artifact deals 1 damage to you.

Lurebound Scarecrow

As this creature enters, choose a color.
When you control no permanents of the chosen color, sacrifice this creature.

Cancel

Component Pouch

{T}, Remove a component counter from this artifact: Add two mana of different colors.
{T}: Roll a d20.
1—9 | Put a component counter on this artifact.
10—20 | Put two component counters on this artifact.

Ebon Drake

Flying
Whenever a player casts a spell, you lose 1 life.

Vodalian Knights

First strike
This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.
{U}: This creature gains flying until end of turn.

Exotic Orchard

Dimir Aqueduct

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {U}{B}.

Sea Serpent

This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.

Mind Stone

{T}: Add {C}.
{1}, {T}, Sacrifice this artifact: Draw a card.

Defabricate

Choose one —
• Counter target artifact or enchantment spell. If a spell is countered this way, exile it instead of putting it into its owner's graveyard.
• Counter target activated or triggered ability.

Assault Suit

Equipped creature gets +2/+2, has haste, can't attack you or planeswalkers you control, and can't be sacrificed.
At the beginning of each opponent's upkeep, you may have that player gain control of equipped creature until end of turn. If you do, untap it.
Equip {3}

Discombobulate

Counter target spell. Look at the top four cards of your library, then put them back in any order.

Clash of Wills

Counter target spell unless its controller pays {X}.

Treacherous Vampire

Flying
Whenever this creature attacks or blocks, sacrifice it unless you exile a card from your graveyard.
Threshold — As long as seven or more cards are in your graveyard, this creature gets +2/+2 and has "When this creature dies, you lose 6 life."

Island

River of Tears

{T}: Add {U}. If you played a land this turn, add {B} instead.

Ichorid

Haste
At the beginning of the end step, sacrifice this creature.
At the beginning of your upkeep, if this card is in your graveyard, you may exile a black creature card other than this card from your graveyard. If you do, return this card to the battlefield.

Straw Golem

When an opponent casts a creature spell, sacrifice this creature.

Bane's Contingency

Counter target spell. If that spell targets a commander you control, instead counter that spell, scry 2, then draw a card.

Whipstitched Zombie

At the beginning of your upkeep, sacrifice this creature unless you pay {B}.

Dispel

Ronom Serpent

This creature can't attack unless defending player controls a snow land.
When you control no snow lands, sacrifice this creature.

Dimir Signet

Evolving Wilds

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Fog Elemental

Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature attacks or blocks, sacrifice it at end of combat.

Draco

Domain — This spell costs {2} less to cast for each basic land type among lands you control.
Flying
Domain — At the beginning of your upkeep, sacrifice this creature unless you pay {10}. This cost is reduced by {2} for each basic land type among lands you control.

Arcane Laboratory

Each player can't cast more than one spell each turn.

Sunken Hollow

({T}: Add {U} or {B}.)
This land enters tapped unless you control two or more basic lands.

Living Tsunami

Flying
At the beginning of your upkeep, sacrifice this creature unless you return a land you control to its owner's hand.

Drowned Catacomb

This land enters tapped unless you control an Island or a Swamp.
{T}: Add {U} or {B}.

Skittering Monstrosity

When you cast a creature spell, sacrifice this creature.

Daring Apprentice

{T}, Sacrifice this creature: Counter target spell.

Polar Kraken

Trample
This creature enters tapped.
Cumulative upkeep—Sacrifice a land. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Molting Harpy

Flying
At the beginning of your upkeep, sacrifice this creature unless you pay {2}.

Dash Hopes

When you cast this spell, any player may pay 5 life. If a player does, counter Dash Hopes.
Counter target spell.

Rotting Regisaur

At the beginning of your upkeep, discard a card.

Marjhan

This creature doesn't untap during your untap step.
{U}{U}, Sacrifice a creature: Untap this creature. Activate only during your upkeep.
This creature can't attack unless defending player controls an Island.
{U}{U}: This creature gets -1/-0 until end of turn and deals 1 damage to target attacking creature without flying.
When you control no Islands, sacrifice this creature.

Skittering Horror

Bog Serpent

This creature can't attack unless defending player controls a Swamp.
When you control no Swamps, sacrifice this creature.

Archfiend of the Dross

Flying
This creature enters with four oil counters on it.
At the beginning of your upkeep, remove an oil counter from this creature. Then if it has no oil counters on it, you lose the game.
Whenever a creature an opponent controls dies, its controller loses 2 life.

Drinker of Sorrow

This creature can't block.
Whenever this creature deals combat damage, sacrifice a permanent.

Amazing Acrobatics

Choose one or both —
• Counter target spell.
• Tap one or two target creatures.

Razormane Masticore

First strike (This creature deals combat damage before creatures without first strike.)
At the beginning of your upkeep, sacrifice this creature unless you discard a card.
At the beginning of your draw step, you may have this creature deal 3 damage to target creature.

Dandân

Spindrift Drake

Flying
At the beginning of your upkeep, sacrifice this creature unless you pay {U}.

Skittering Skirge

Flying
When you cast a creature spell, sacrifice this creature.

Junún Efreet

Flying
At the beginning of your upkeep, sacrifice this creature unless you pay {B}{B}.

Myriad Landscape

This land enters tapped.
{T}: Add {C}.
{2}, {T}, Sacrifice this land: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle.

Runaway Carriage

Trample
When this creature attacks or blocks, sacrifice it at end of combat.

Island Fish Jasconius

This creature doesn't untap during your untap step.
At the beginning of your upkeep, you may pay {U}{U}{U}. If you do, untap this creature.
This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.

Cabal Executioner

Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice.
Morph {3}{B}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Temple of Deceit

This land enters tapped.
When this land enters, scry 1. (Look at the top card of your library. You may put that card on the bottom.)
{T}: Add {U} or {B}.

Phylactery Lich

Indestructible
As this creature enters, put a phylactery counter on an artifact you control.
When you control no permanents with phylactery counters on them, sacrifice this creature.

Drifter il-Dal

Shadow (This creature can block or be blocked by only creatures with shadow.)
At the beginning of your upkeep, sacrifice this creature unless you pay {U}.

Illusory Demon

Flying
When you cast a spell, sacrifice this creature.

Fetid Pools

({T}: Add {U} or {B}.)
This land enters tapped.
Cycling {2} ({2}, Discard this card: Draw a card.)

Skeleton Ship

When you control no Islands, sacrifice Skeleton Ship.
{T}: Put a -1/-1 counter on target creature.

Didn't Say Please

Counter target spell. Its controller mills three cards.

Counterspell

Pit Raptor

Flying, first strike
At the beginning of your upkeep, sacrifice this creature unless you pay {2}{B}{B}.

Demonic Taskmaster

Flying
At the beginning of your upkeep, sacrifice a creature other than this creature.

Junk Golem

This creature enters with three +1/+1 counters on it.
At the beginning of your upkeep, sacrifice this creature unless you remove a +1/+1 counter from it.
{1}, Discard a card: Put a +1/+1 counter on this creature.

Deep Spawn

Trample
At the beginning of your upkeep, sacrifice this creature unless you mill two cards.
{U}: This creature gains shroud until end of turn and doesn't untap during your next untap step. Tap this creature. (A creature with shroud can't be the target of spells or abilities.)

Command Tower

Giant Shark

This creature can't attack unless defending player controls an Island.
Whenever this creature blocks or becomes blocked by a creature that has been dealt damage this turn, this creature gets +2/+0 and gains trample until end of turn.
When you control no Islands, sacrifice this creature.

Disrupt

Counter target instant or sorcery spell unless its controller pays {1}.
Draw a card.

Countersquall

Counter target noncreature spell. Its controller loses 2 life.

Circling Vultures

Flying
You may discard this card any time you could cast an instant.
At the beginning of your upkeep, sacrifice this creature unless you exile the top creature card of your graveyard.

Dream Fracture

Counter target spell. Its controller draws a card.
Draw a card.

Bog Elemental

Protection from white
At the beginning of your upkeep, sacrifice this creature unless you sacrifice a land.

Thing from the Deep

Whenever this creature attacks, sacrifice it unless you sacrifice an Island.

Heartless Summoning

Creature spells you cast cost {2} less to cast.
Creatures you control get -1/-1.

Terramorphic Expanse

Evil Eye of Urborg

Non-Eye creatures you control can't attack.
Whenever this creature becomes blocked by a creature, destroy that creature.

Fettergeist

Flying
At the beginning of your upkeep, sacrifice this creature unless you pay {1} for each other creature you control.

Seasinger

When you control no Islands, sacrifice this creature.
You may choose not to untap this creature during your untap step.
{T}: Gain control of target creature whose controller controls an Island for as long as you control this creature and this creature remains tapped.

Anticognition

Counter target creature or planeswalker spell unless its controller pays {2}. If an opponent has eight or more cards in their graveyard, instead counter that spell, then scry 2.

Extravagant Spirit

Flying
At the beginning of your upkeep, sacrifice this creature unless you pay {1} for each card in your hand.

School of Piranha

At the beginning of your upkeep, sacrifice this creature unless you pay {1}{U}.

Cursecatcher

Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays {1}.

Keldon Battlewagon

Trample
This creature can't block.
When this creature attacks, sacrifice it at end of combat.
Tap an untapped creature you control: This creature gets +X/+0 until end of turn, where X is the power of the creature tapped this way.

Dissolve

Counter target spell. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)