Avatar: The Last Airbender

Ally

Sorcery

Create X 1/1 white Ally creature tokens, then put a +1/+1 counter on each creature you control.

United Front

Each creature you control gains firebending 5 until end of turn. (Whenever it attacks, add {R}{R}{R}{R}{R}. This mana lasts until end of combat.)
Foretell {2}{R} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Sozin's Comet

Legendary Creature — Human Noble

Firebending 2 (Whenever this creature attacks, add {R}{R}. This mana lasts until end of combat.)
Whenever you cast a spell while Fire Lord Azula is attacking, copy that spell. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.)

Fire Lord Azula

Multiverse Legends

Legendary Creature — Phyrexian Praetor

Trample
Whenever you tap a land for mana, add one mana of any type that land produced.
Whenever an opponent taps a land for mana, that land doesn't untap during its controller's next untap step.

Vorinclex, Voice of Hunger

Brudiclad, Telchor Engineer

Phyrexian Myr

Legendary Artifact Creature — Phyrexian Artificer

Creature tokens you control have haste.
At the beginning of combat on your turn, create a 2/1 blue Phyrexian Myr artifact creature token. Then you may choose a token you control. If you do, each other token you control becomes a copy of that token.

Experience

Ezuri, Claw of Progress

Legendary Creature — Phyrexian Elf Warrior

Whenever a creature you control with power 2 or less enters, you get an experience counter.
At the beginning of combat on your turn, put X +1/+1 counters on another target creature you control, where X is the number of experience counters you have.

Card

Rustvine Cultivator

Phyrexia: All Will Be One Art Series

Myr Convert

Phyrexia: All Will Be One

Artifact Creature — Phyrexian Wizard

When this creature enters, it deals X damage to any target, where X is the number of permanents you control with oil counters on them.

Urabrask's Anointer

Creature — Phyrexian Elf Druid

{T}: Put an oil counter on this creature.
{T}, Remove an oil counter from this creature: Untap target land.

Poison Counter

Artifact Creature — Phyrexian Myr

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)
{T}, Pay 2 life: Add one mana of any color.

When Ezuri enters, you may pay {3}. If you do, proliferate twice.
Whenever you proliferate, draw a card.

Ezuri, Stalker of Spheres

Secret Lair Countdown

Whenever you cast a creature spell this turn, draw a card.

Glimpse of Nature

Secret Lair Drop

Legendary Creature — Rat Ninja

Ninjutsu {3}{B}{B} ({3}{B}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Ink-Eyes deals combat damage to a player, you may put target creature card from that player's graveyard onto the battlefield under your control.
{1}{B}: Regenerate Ink-Eyes.

Ink-Eyes, Servant of Oni

Legendary Creature — Human Advisor

Whenever a source an opponent controls deals damage to you, that player sacrifices a permanent of their choice.

Michiko Konda, Truth Seeker

Legendary Creature — Spirit

At the beginning of each player's draw step, that player draws an additional card.

Kami of the Crescent Moon

Legendary Creature — Human Samurai

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)
Whenever a creature an opponent controls dies, you may cast target instant card from your graveyard. If that spell would be put into a graveyard, exile it instead.

Toshiro Umezawa

Legendary Creature — Ogre Shaman

{T}: Heartless Hidetsugu deals damage to each player equal to half that player's life total, rounded down.

Heartless Hidetsugu

Legendary Creature — Human Shaman

Whenever you cast a legendary spell, draw a card.

Reki, the History of Kamigawa

Legendary Creature — Phyrexian Minion

Xantcha enters under the control of an opponent of your choice.
Xantcha attacks each combat if able and can't attack its owner or planeswalkers its owner controls.
{3}: Xantcha's controller loses 2 life and you draw a card. Any player may activate this ability.