Corrupted Conviction

As an additional cost to cast this spell, sacrifice a creature.
Draw two cards.

Binding Negotiation

Target opponent reveals their hand. You may choose a nonland card from it. If you do, they discard it. Otherwise, you may put a face-up exiled card they own into their graveyard.

Loam Larva

When this creature enters, you may search your library for a basic land card, reveal it, then shuffle and put that card on top.

Psychic Whorl

Target opponent discards two cards. Then if you control a Rat, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Strength from the Fallen

Constellation — Whenever this enchantment or another enchantment you control enters, target creature gets +X/+X until end of turn, where X is the number of creature cards in your graveyard.

Grasping Longneck

Reach
When this creature dies, you gain 2 life.

Flesh Burrower

Deathtouch
Whenever this creature attacks, another target creature you control gains deathtouch until end of turn.

Fen Hauler

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
Fen Hauler can't be blocked by artifact creatures.

Hidden Grotto

When this land enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
{T}: Add {C}.
{1}, {T}: Add one mana of any color.

Pitiless Carnage

Sacrifice any number of permanents you control, then draw that many cards.
Plot {1}{B}{B} (You may pay {1}{B}{B} and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)

Ambush Krotiq

Trample
When this creature enters, return another creature you control to its owner's hand.

Giant Spider

Reach (This creature can block creatures with flying.)

Miasma Demon

Flying
When this creature enters, you may discard any number of cards. When you do, up to that many target creatures each get -2/-2 until end of turn.

Swamp

Forest

Spire Mangler

Flash
Flying
When this creature enters, target creature you control with flying gets +2/+0 until end of turn.

Grist, the Hunger Tide

As long as Grist isn't on the battlefield, it's a 1/1 Insect creature in addition to its other types.
+1: Create a 1/1 black and green Insect creature token, then mill a card. If an Insect card was milled this way, put a loyalty counter on Grist and repeat this process.
−2: You may sacrifice a creature. When you do, destroy target creature or planeswalker.
−5: Each opponent loses life equal to the number of creature cards in your graveyard.

Dross Hopper

Sacrifice a creature: This creature gains flying until end of turn.

Reach for the Sky

Flash
Enchant creature
Enchanted creature gets +3/+2 and has reach.
When this Aura is put into a graveyard from the battlefield, draw a card.

Become Immense

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)
Target creature gets +6/+6 until end of turn.

Valgavoth's Lair

Hexproof
This land enters tapped. As it enters, choose a color.
{T}: Add one mana of the chosen color.

Dross Skullbomb

{1}, Sacrifice this artifact: Draw a card.
{2}{B}, Sacrifice this artifact: Return target creature card from your graveyard to your hand. Draw a card. Activate only as a sorcery.

Giant Mantis

Morph

(You can cover a face-down creature with this reminder card.
A card with morph can be turned face up any time for its morph cost.)

Overprotect

Target creature you control gets +3/+3 and gains trample, hexproof, and indestructible until end of turn.

Quarry Beetle

When this creature enters, you may return target land card from your graveyard to the battlefield.

Ironshell Beetle

When this creature enters, put a +1/+1 counter on target creature.

Perilous Shadow

{1}{B}: This creature gets +2/+2 until end of turn.

Frantic Strength

Flash
Enchant creature
Enchanted creature gets +2/+2 and has trample.

Golgari Guildgate

This land enters tapped.
{T}: Add {B} or {G}.

Crushing Canopy

Choose one —
• Destroy target creature with flying.
• Destroy target enchantment.

Fruit of the First Tree

Enchant creature
When enchanted creature dies, you gain X life and draw X cards, where X is its toughness.

Feast of Dreams

Destroy target enchanted creature or enchantment creature.

Chorus of Might

Until end of turn, target creature gets +1/+1 for each creature you control and gains trample.

Dead Weight

Enchant creature
Enchanted creature gets -2/-2.

Manifest Dread

Manifest dread. (Look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)

Golden Hind

Ambush Gigapede

Flash
When this creature enters, target creature an opponent controls gets -2/-2 until end of turn.

Segmented Krotiq

Megamorph {6}{G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

Weight Room

When you unlock this door, manifest dread, then put three +1/+1 counters on that creature.
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)

Moldering Gym

When you unlock this door, search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)

Moldering Gym // Weight Room

Insect

Strangling Spores

Target creature gets -3/-3 until end of turn.

Kraul Foragers

Undergrowth — When this creature enters, you gain 1 life for each creature card in your graveyard.

Kraul Harpooner

Reach
Undergrowth — When this creature enters, choose up to one target creature you don't control with flying. This creature gets +X/+0 until end of turn, where X is the number of creature cards in your graveyard, then you may have this creature fight that creature.

Servant of the Stinger

Deathtouch
Whenever this creature deals combat damage to a player, if you've committed a crime this turn, you may sacrifice this creature. If you do, search your library for a card, put it into your hand, then shuffle. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.)

Dune Beetle

Murder

Fell

Manifest

(You can cover a face-down manifested creature with this reminder card.
A manifested creature card can be turned face up any time for its mana cost. A face-down card can also be turned face up for its morph cost.)

Huskburster Swarm

This spell costs {1} less to cast for each creature card you own in exile and in your graveyard.
Menace, deathtouch

Sanitarium Skeleton

{2}{B}: Return this card from your graveyard to your hand.

Give In to Violence

Target creature gets +2/+2 and gains lifelink until end of turn.

Powerstone Fracture

As an additional cost to cast this spell, sacrifice an artifact or creature.
Destroy target creature or planeswalker.

Font of Fertility

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

Scavenging Scarab

Rot Farm Mortipede

Whenever one or more creature cards leave your graveyard, this creature gets +1/+0 and gains menace and lifelink until end of turn.

Blooming Marsh

This land enters tapped unless you control two or fewer other lands.
{T}: Add {B} or {G}.

Sentinel Spider

Jungle Hollow

This land enters tapped.
When this land enters, you gain 1 life.
{T}: Add {B} or {G}.

Kraul Warrior

{5}{G}: This creature gets +3/+3 until end of turn.

Winter's Intervention

Winter's Intervention deals 2 damage to target creature. You gain 2 life.

Vile Mutilator

As an additional cost to cast this spell, sacrifice a creature or enchantment.
Flying, trample
When this creature enters, each opponent sacrifices a nontoken enchantment of their choice, then sacrifices a nontoken creature of their choice.