Standard MTG sets

Firebending X, where X is the number of creatures you control. (Whenever this creature attacks, add X {R}. This mana lasts until end of combat.) {5...

Suki's power is equal to the number of creatures you control. Whenever Suki attacks, create a 1/1 white Ally creature token that's tapped and attac...

Menace, prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) Other Allies you control have menace and prowe...

Vigilance Whenever Sokka and at least one other creature attack, draw a card.

Whenever you sacrifice another permanent, put a +1/+1 counter on this creature. When this creature dies, you may exile it. When you do, return targ...

{T}, Discard a card: Draw a card. {1}, {T}, Sacrifice Professor Zei: Return target instant or sorcery card from your graveyard to your hand. Activa...

When this creature dies, create a 1/1 white Ally creature token.

When this creature dies, create a 1/1 white Ally creature token.

Defender When this creature enters, mill two cards. (Put the top two cards of your library into your graveyard.) As long as there is a Lesson card ...

Flying When this creature enters, create a Clue token. (It's an artifact with "{2}, Sacrifice this token: Draw a card.") This creature gets +2/+0 a...

Flying When this creature enters, create a Clue token. (It's an artifact with "{2}, Sacrifice this token: Draw a card.") This creature gets +2/+0 a...

Whenever another creature you control or a land you control is put into a graveyard from the battlefield, put a +1/+1 counter on target creature yo...

When this enchantment enters, exile target nonland permanent an opponent controls until this enchantment leaves the battlefield.

When Jet enters, he deals damage equal to the number of creatures you control to target creature an opponent controls. When Jet dies, put a +1/+1 c...

Firebending 2 During your turn, each non-Lesson instant and sorcery card in your graveyard has flashback. The flashback cost is equal to that card'...

{T}: Add one mana of any color. {T}: Add two mana in any combination of colors. Spend this mana only to cast Lesson spells.

Whenever Hei Bai enters or attacks, you may sacrifice another creature or artifact. If you do, put two +1/+1 counters on Hei Bai. When Hei Bai leav...

Whenever Hei Bai enters or attacks, you may sacrifice another creature or artifact. If you do, put two +1/+1 counters on Hei Bai. When Hei Bai leav...

When Hama enters, target opponent mills three cards. Exile up to one noncreature, nonland card from that player's graveyard. For as long as you con...

When Guru Pathik enters, look at the top five cards of your library. You may reveal a Lesson, Saga, or Shrine card from among them and put it into ...

Lifelink Whenever you draw your second card each turn, create a 1/1 colorless Spirit creature token with "This token can't block or be blocked by n...

Lifelink Whenever you draw your second card each turn, create a 1/1 colorless Spirit creature token with "This token can't block or be blocked by n...

When this Equipment enters, airbend up to one target creature. (Exile it. While it's exiled, its owner may cast it for {2} rather than its mana cos...

When this creature dies, earthbend 2. (Target land you control becomes a 0/0 creature with haste that's still a land. Put two +1/+1 counters on it....