If a triggered ability of an Ally you control triggers, that ability triggers an additional time.
"I will never, ever turn my back on people who need me!"
Vigilance
When Katara enters, create a 1/1 white Ally creature token.
Waterbend : Creatures you control have base power and toughness X/X until end of turn. X can't be 0. Activate only during your turn. (While paying a waterbend cost, you can tap your artifacts and creatures to help. Each one pays for .)
Vigilance, reach
When The Lion-Turtle enters, you gain 3 life.
The Lion-Turtle can't attack or block unless there are three or more Lesson cards in your graveyard.
: Add one mana of any color.
Trample, firebending 4, haste
If you would lose unspent mana, that mana becomes red instead.
Ozai has flying and indestructible as long as you have six or more unspent mana.
"Out of the ashes, a new world will be born."
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!"
Menace, prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Other Allies you control have menace and prowess.
Whenever you cast a noncreature spell, create a 1/1 white Ally creature token.
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.)
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.)
At the beginning of your first main phase, choose one that hasn't been chosen and you lose 2 life —
• Draw a card.
• Put a +1/+1 counter on Zuko.
• Add .
• Exile Zuko, then return him to the battlefield under an opponent's control.
, : 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.
Defender
Other permanents you control have indestructible.
"That is why the city is named Ba Sing Se. It's the 'impenetrable city.'"
—General Sung
This artifact enters tapped.
: Add X mana of any one color, where X is the greatest number of creatures you control that have a creature type in common.
"Most people think the lotus tile insignificant, but it is essential for the unusual strategy that I employ."
—Iroh
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