Decomposition

Enchant black creature
Enchanted creature has "Cumulative upkeep—Pay 1 life." (At the beginning of its controller's upkeep, that player puts an age counter on it, then sacrifices it unless they pay its upkeep cost for each age counter on it.)
When enchanted creature dies, its controller loses 2 life.

Regeneration

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
{G}: Regenerate enchanted creature. (The next time that creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Lava Burst

Lava Burst deals X damage to any target. If Lava Burst would deal damage to a creature, that damage can't be prevented or dealt instead to another permanent or player.

Canopy Dragon

Trample
{1}{G}: This creature gains flying and loses trample until end of turn.

Emperor Crocodile

When you control no other creatures, sacrifice this creature.

Feral Instinct

Target creature gets +1/+1 until end of turn.
Draw a card at the beginning of the next turn's upkeep.

Endangered Armodon

When you control a creature with toughness 2 or less, sacrifice this creature.

Crystal Vein

{T}: Add {C}.
{T}, Sacrifice this land: Add {C}{C}.

Mage il-Vec

{T}, Discard a card at random: This creature deals 1 damage to any target.

Chain Lightning

Chain Lightning deals 3 damage to any target. Then that player or that permanent's controller may pay {R}{R}. If the player does, they may copy this spell and may choose a new target for that copy.

Teferi's Puzzle Box

At the beginning of each player's draw step, that player puts the cards in their hand on the bottom of their library in any order, then draws that many cards.

Crypt Rats

{X}: This creature deals X damage to each creature and each player. Spend only black mana on X.

Venomous Fangs

Enchant creature
Whenever enchanted creature deals damage to a creature, destroy the other creature.

Vug Lizard

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)
Echo {1}{R}{R} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

Plague Beetle

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Triassic Egg

{3}, {T}: Put a hatchling counter on this artifact.
Sacrifice this artifact: Choose one. Activate only if there are two or more hatchling counters on this artifact.
• You may put a creature card from your hand onto the battlefield.
• Return target creature card from your graveyard to the battlefield.

Flame Spirit

{R}: This creature gets +1/+0 until end of turn.

Forethought Amulet

At the beginning of your upkeep, sacrifice this artifact unless you pay {3}.
If an instant or sorcery source would deal 3 or more damage to you, it deals 2 damage to you instead.

Emerald Charm

Choose one —
• Untap target permanent.
• Destroy target non-Aura enchantment.
• Target creature loses flying until end of turn.

Hornet Cobra

Anaconda

Horn of Greed

Whenever a player plays a land, that player draws a card.

Simoon

Simoon deals 1 damage to each creature target opponent controls.

Sabertooth Cobra

Whenever this creature deals damage to a player, that player gets a poison counter. The player gets another poison counter at the beginning of their next upkeep unless they pay {2} before that step. (A player with ten or more poison counters loses the game.)

Raging Spirit

{2}: This creature becomes colorless until end of turn.

Craven Giant

King Cheetah

Bestial Fury

Enchant creature
When this Aura enters, draw a card at the beginning of the next turn's upkeep.
Whenever enchanted creature becomes blocked, it gets +4/+0 and gains trample until end of turn.

Cave Tiger

Whenever this creature becomes blocked by a creature, this creature gets +1/+1 until end of turn.

Locust Swarm

Flying
{G}: Regenerate this creature.
{G}: Untap this creature. Activate only once each turn.

Raging Gorilla

Whenever this creature blocks or becomes blocked, it gets +2/-2 until end of turn.

Canopy Spider

Reach (This creature can block creatures with flying.)

Seedling Charm

Choose one —
• Return target Aura attached to a creature to its owner's hand.
• Regenerate target green creature.
• Target creature gains trample until end of turn.

Citanul Hierophants

Creatures you control have "{T}: Add {G}."

Death Watch

Enchant creature
When enchanted creature dies, its controller loses life equal to its power and you gain life equal to its toughness.

Jungle Wurm

Whenever this creature becomes blocked, it gets -1/-1 until end of turn for each creature blocking it beyond the first.

Choking Vines

Cast this spell only during the declare blockers step.
X target attacking creatures become blocked. Choking Vines deals 1 damage to each of those creatures. (This spell works on creatures that can't be blocked.)

Giant Mantis

Fallen Askari

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
This creature can't block.

Wing Snare

Volcanic Geyser

Volcanic Geyser deals X damage to any target.

Lightning Cloud

Whenever a player casts a red spell, you may pay {R}. If you do, this enchantment deals 1 damage to any target.

Rogue Elephant

When this creature enters, sacrifice it unless you sacrifice a Forest.

Xira Arien

Flying
{B}{R}{G}, {T}: Target player draws a card.

Dauthi Embrace

{B}{B}: Target creature gains shadow until end of turn. (It can block or be blocked by only creatures with shadow.)

Natural Order

As an additional cost to cast this spell, sacrifice a green creature.
Search your library for a green creature card, put it onto the battlefield, then shuffle.

Momentum

Enchant creature
At the beginning of your upkeep, you may put a growth counter on this Aura.
Enchanted creature gets +1/+1 for each growth counter on this Aura.

Sabretooth Tiger

Crystal Golem

At the beginning of your end step, this creature phases out. (While it's phased out, it's treated as though it doesn't exist. It phases in before you untap during your next untap step.)

Carrion Ants

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

Malachite Talisman

Whenever a player casts a green spell, you may pay {3}. If you do, untap target permanent.

Sisay's Ring

Gorilla War Cry

Cast this spell only during combat before blockers are declared.
All creatures gain menace until end of turn. (They can't be blocked except by two or more creatures.)
Draw a card at the beginning of the next turn's upkeep.

Pyric Salamander

{R}: This creature gets +1/+0 until end of turn. Sacrifice this creature at the beginning of the next end step.

Tuknir Deathlock

Flying
{R}{G}, {T}: Target creature gets +2/+2 until end of turn.

Yavimaya Ants

Trample, haste
Cumulative upkeep {G}{G} (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.)

Wicked Reward

As an additional cost to cast this spell, sacrifice a creature.
Target creature gets +4/+2 until end of turn.

Ravenous Baboons

When this creature enters, destroy target nonbasic land.

Rats of Rath

{B}: Destroy target artifact, creature, or land you control.

Superior Numbers

Superior Numbers deals damage to target creature equal to the number of creatures you control in excess of the number of creatures target opponent controls.

Bottomless Vault

This land enters tapped.
You may choose not to untap this land during your untap step.
At the beginning of your upkeep, if this land is tapped, put a storage counter on it.
{T}, Remove any number of storage counters from this land: Add {B} for each storage counter removed this way.

River Boa

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{G}: Regenerate this creature.

Inferno

Inferno deals 6 damage to each creature and each player.

Gorilla Berserkers

Trample; rampage 2 (Whenever this creature becomes blocked, it gets +2/+2 until end of turn for each creature blocking it beyond the first.)
This creature can't be blocked except by three or more creatures.

Kird Ape

This creature gets +1/+2 as long as you control a Forest.

Spitting Earth

Spitting Earth deals damage to target creature equal to the number of Mountains you control.

Flowstone Sculpture

{2}, Discard a card: Put a +1/+1 counter on this creature or this creature gains flying, first strike, or trample. (This effect lasts indefinitely.)

Renegade Warlord

First strike
Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.

Hungry Mist

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

Sword of the Ages

This artifact enters tapped.
{T}, Sacrifice this artifact and any number of creatures you control: This artifact deals X damage to any target, where X is the total power of the creatures sacrificed this way, then exile this artifact and those creature cards.

Necromancy

You may cast this spell as though it had flash. If you cast it any time a sorcery couldn't have been cast, the controller of the permanent it becomes sacrifices it at the beginning of the next cleanup step.
When this enchantment enters, if it's on the battlefield, it becomes an Aura with "enchant creature put onto the battlefield with Necromancy." Put target creature card from a graveyard onto the battlefield under your control and attach this enchantment to it. When this enchantment leaves the battlefield, that creature's controller sacrifices it.

Fire Diamond

Fire Diamond enters tapped.
{T}: Add {R}.

Village Elder

{G}, {T}, Sacrifice a Forest: Regenerate target creature.

Seeds of Innocence

Destroy all artifacts. They can't be regenerated. The controller of each of those artifacts gains life equal to its mana value.

Femeref Archers

{T}: This creature deals 4 damage to target attacking creature with flying.

Rootwater Alligator

Sacrifice a Forest: Regenerate this creature.

Uktabi Wildcats

Uktabi Wildcats's power and toughness are each equal to the number of Forests you control.
{G}, Sacrifice a Forest: Regenerate this creature.

Bull Hippo

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Dread Specter

Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat.

Diamond Kaleidoscope

{3}, {T}: Create a 0/1 colorless Prism artifact creature token.
Sacrifice a Prism token: Add one mana of any color.

Touch of Vitae

Until end of turn, target creature gains haste and "{0}: Untap this creature. Activate only once."
Draw a card at the beginning of the next turn's upkeep.

Powerleech

Whenever an artifact an opponent controls becomes tapped or an opponent activates an artifact's ability without {T} in its activation cost, you gain 1 life.

Uktabi Orangutan

When this creature enters, destroy target artifact.

Rain of Filth

Until end of turn, lands you control gain "Sacrifice this land: Add {B}."

Sol Grail

As this artifact enters, choose a color.
{T}: Add one mana of the chosen color.

Concordant Crossroads

Delirium

Cast this spell only during an opponent's turn.
Tap target creature that player controls. That creature deals damage equal to its power to the player. Prevent all combat damage that would be dealt to and dealt by the creature this turn.

Lapis Lazuli Talisman

Whenever a player casts a blue spell, you may pay {3}. If you do, untap target permanent.

Ring of Immortals

{3}, {T}: Counter target instant or Aura spell that targets a permanent you control.

Abyssal Hunter

{B}, {T}: Tap target creature. This creature deals damage equal to its power to that creature.

Gargantuan Gorilla

At the beginning of your upkeep, you may sacrifice a Forest. If you sacrifice a snow Forest this way, this creature gains trample until end of turn. If you don't sacrifice a Forest, sacrifice this creature and it deals 7 damage to you.
{T}: This creature deals damage equal to its power to another target creature. That creature deals damage equal to its power to this creature.

Mantis Engine

{2}: This creature gains flying until end of turn. (It can't be blocked except by creatures with flying or reach.)
{2}: This creature gains first strike until end of turn. (It deals combat damage before creatures without first strike.)

Unyaro Bee Sting

Unyaro Bee Sting deals 2 damage to any target.

Jungle Troll

{R}: Regenerate this creature.
{G}: Regenerate this creature.

Scarab of the Unseen

{T}, Sacrifice this artifact: Return all Auras attached to target permanent you own to their owners' hands. Draw a card at the beginning of the next turn's upkeep.

Fertile Ground

Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color.

Ichneumon Druid

Whenever an opponent casts an instant spell other than the first instant spell that player casts each turn, this creature deals 4 damage to that player.

Rootwalla

{1}{G}: This creature gets +2/+2 until end of turn. Activate only once each turn.

Ancient Tomb

{T}: Add {C}{C}. This land deals 2 damage to you.

Reckless Embermage

{1}{R}: This creature deals 1 damage to any target and 1 damage to itself.

Cinder Crawler

{R}: This creature gets +1/+0 until end of turn. Activate only if this creature is blocked.

Triangle of War

{2}, Sacrifice this artifact: Target creature you control fights target creature an opponent controls. (Each deals damage equal to its power to the other.)

Crypt Cobra

Whenever this creature attacks and isn't blocked, defending player gets a poison counter. (A player with ten or more poison counters loses the game.)

Spike Hatcher

This creature enters with six +1/+1 counters on it.
{2}, Remove a +1/+1 counter from this creature: Put a +1/+1 counter on target creature.
{1}, Remove a +1/+1 counter from this creature: Regenerate this creature.

Gorilla Chieftain

Incinerate

Incinerate deals 3 damage to any target. A creature dealt damage this way can't be regenerated this turn.