If a triggered ability of an Ally you control triggers, that ability triggers an additional time.
Nontoken artifacts you control are lands in addition to their other types. (They don't gain the ability to for mana.)
At the beginning of your end step, 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. When it dies or is exiled, return it to the battlefield tapped.)
Flying, firebending 2
Whenever you waterbend, earthbend, firebend, or airbend, draw a card. Then if you've done all four this turn, transform Avatar Aang.
"It's easy to do nothing. It's hard to forgive."
Flying
Spells you cast cost less to cast. (This can reduce generic costs.)
At the beginning of each upkeep, you may transform Aang, Master of Elements. If you do, you gain 4 life, draw four cards, put four +1/+1 counters on him, and he deals 4 damage to each opponent.
When this enchantment enters, airbend up to one target creature.
Whenever a creature you control enters, put a quest counter on this enchantment.
At the beginning of your end step, if this enchantment has four or more quest counters on it, exile up to one target creature you control, then return it to the battlefield under its owner's control.
Choose up to one target creature, then airbend all other creatures. (Exile them. While each one is exiled, its owner may cast it for rather than its mana cost.)
Until your next turn, your opponents can't cast spells from anywhere other than their hands.
Exile Avatar's Wrath.
Vigilance
You may look at the top card of your library any time.
You may cast Ally spells from the top of your library.
Sacrifice Hakoda: Creatures you control get +0/+5 and gain indestructible until end of turn.
Whenever this creature or another Ally you control enters, you gain 1 life. If this is the second time this ability has resolved this turn, draw a card.
"The winds can be brutal, so be brave."
Other creatures you control get +1/+0.
Whenever another permanent you control leaves the battlefield during your turn, create a 1/1 white Ally creature token. This ability triggers only once each turn.
"I'm okay. Just finish the mission!"
Whenever you cast a noncreature spell, create a Clue token. (It's an artifact with ", Sacrifice this token: Draw a card.")
: Until end of turn, target artifact token you control becomes a 3/1 Construct artifact creature with flying.
"We're just in the process of improving upon what's already here."
As an additional cost to cast this spell, you may waterbend . (While paying a waterbend cost, you can tap your artifacts and creatures to help. Each one pays for .)
Draw two cards. If this spell's additional cost was paid, instead shuffle your graveyard into your library, draw seven cards, and you have no maximum hand size for the rest of the game.
Exile Spirit Water Revival.
Flash
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Ty Lee enters, tap up to one target creature. It doesn't untap during its controller's untap step for as long as you control Ty Lee.
Firebending 1 (Whenever this creature attacks, add . This mana lasts until end of combat.)
Tap an untapped Ally you control: Exile target card from a graveyard.
Whenever this creature attacks, you may cast an Ally spell from among cards you own exiled with this creature.
Each creature with mana value X or less loses all abilities until end of turn. Destroy those creatures.
The solar eclipse robbed Firebenders of their ability to firebend, giving Team Avatar an eight-minute window to storm the capital and defeat the Fire Lord.
First strike
Whenever a player casts a noncreature spell, they lose 2 life.
"You miscalculated. I love Zuko more than I fear you."
Haste
Whenever another Ally you control enters, put a +1/+1 counter on that creature and it gains haste until end of turn.
Fire Lord Ozai's cruel reign only forged a stronger resolve in the hearts of the resistance.
Menace
Nonbasic lands enter tapped.
: Put a conqueror counter on Zhao.
As long as Zhao has a conqueror counter on him, nonbasic lands are Mountains. (They lose all other land types and abilities and have ": Add .")
This creature gets +1/+0 for each color among Allies you control.
: Earthbend 5. (Target land you control becomes a 0/0 creature with haste that's still a land. Put five +1/+1 counters on it. When it dies or is exiled, return it to the battlefield tapped.)
"Together, we are unshakable."
Search your library for up to four land cards with different names and reveal them. An opponent chooses two of those cards. Put the chosen cards into your graveyard and the rest onto the battlefield tapped, then shuffle.
"Understanding others, the other elements, and the other nations will help you become whole."
—Iroh
Whenever a nonland creature you control dies, earthbend X, where X is that creature's power. (Target land you control becomes a 0/0 creature with haste that's still a land. Put X +1/+1 counters on it. When it dies or is exiled, return it to the battlefield tapped.)
"Let's take them now."
Trample
When this creature enters, put a +1/+1 counter on each other Ally creature you control.
Whenever another Ally you control enters, put a +1/+1 counter on this creature.
"You know well the cost of war."
When Iroh enters, create a Food token.
At the beginning of combat on your turn, you may have target opponent gain control of target permanent you control. When you do, create a 1/1 white Ally creature token. Put a +1/+1 counter on that token for each permanent you own that your opponents control.
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 target creature card with mana value less than or equal to this creature's power from your graveyard to the battlefield.
When Sokka enters, discard up to two cards, then draw that many cards.
Whenever you cast an artifact or Lesson spell, put a +1/+1 counter on Sokka.
"I'm just a guy with a boomerang!"
When Toph enters, you may discard a card. If you do, return target instant or sorcery card from your graveyard to your hand.
Whenever you cast a spell, earthbend 1. If that spell is a Lesson, put an additional +1/+1 counter on that land. (Target land you control becomes a 0/0 creature with haste that's still a land. Put a +1/+1 counter on it. When it dies or is exiled, return it to the battlefield tapped.)
, : Scry 2.
Whenever you scry or surveil, look at the top card of your library. You may cast that card without paying its mana cost. Do this only once each turn. (Look at the card after you scry or surveil.)
It charts the movements of heavenly bodies, forecasting the fates of nations.
This land enters tapped unless you control a basic land.
: Add .
, : Put a +1/+1 counter on each creature you control.
Aang once knew this place to be full of monks, lemurs, and bison.
This land enters tapped unless you control a basic land.
: Add .
, : Draw a card, then discard a card.
"The frozen tundra is treacherous, the landscape itself is an icy fortress."
—Admiral Zhao
This land enters tapped unless you control a basic land.
: Add .
, : Earthbend 2. Activate only as a sorcery. (Target land you control becomes a 0/0 creature with haste that's still a land. Put two +1/+1 counters on it. When it dies or is exiled, return it to the battlefield tapped.)
This land enters tapped unless you control a basic land.
: Add .
, : Target creature you control gains firebending 4 until end of turn. (Whenever it attacks, add . This mana lasts until end of combat.)
: Add .
: Add one mana of any color. Spend this mana only to cast an Ally spell or activate an ability of an Ally source.
, : Create a 1/1 white Ally creature token.
Where the secret ingredient truly is love.
This land enters tapped unless you control a basic land.
: Add .
, : Create a 1/1 colorless Spirit creature token with "This token can't block or be blocked by non-Spirit creatures."
Aang delved deep into the spiraling depths in search of wherever Koh called home.
This land can't be blocked.
: Add .
, : Two target creatures you control that share a creature type can't be blocked this turn.
"I forget the next couple of lines, but then it goes...'Secret tunnel! Secret tunnel!"
—Chong, nomad musician
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Firebending X, where X is this creature's power. (Whenever this creature attacks, add X . This mana lasts until end of combat.)
Flying
The first non-Lemur creature spell with flying you cast during each of your turns costs less to cast.
Whenever another creature you control with flying enters, Momo gets +1/+1 until end of turn.