Yuhong Ding

Many of the those who aided in the invasion of the Fire Nation were not soldiers by occupation, though they were warriors at heart.

Invasion Reinforcements

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

Shark Typhoon

Whenever you cast a noncreature spell, create an X/X blue Shark creature token with flying, where X is that spell's mana value.
Cycling {X}{1}{U} ({X}{1}{U}, Discard this card: Draw a card.)
When you cycle this card, create an X/X blue Shark creature token with flying.

Magnificent End // Magnificent End

The flames were near him. His companions were leaving him. He bent his bow for the last time.

Magnificent End

This spell costs {3} less to cast if it targets a tapped creature.
Magnificent End deals 5 damage to target creature.

Kíli the Resourceful

Storied (If you control three or more artifacts, legendaries, and/or Sagas, you have an enduring story for the rest of the game.)
As long as you have an enduring story, you may pay {0} rather than pay the equip cost of the first equip ability you activate each turn.
Whenever another Dwarf or Equipment you control enters, draw a card. This ability triggers only once each turn.

"Slash them! Beat them! Bite them! Gnash them!"

Great Goblin, Foul-Hearted

Whenever Great Goblin enters or attacks, amass Goblins 3. (Put three +1/+1 counters on an Army you control. It's also a Goblin. If you don't control an Army, create a 0/0 black Goblin Army creature token first.)
Armies you control have trample.

The Goblins hated the Eagles and feared them, but could not reach their lofty seats or drive them from the mountains.

Eagle of the Great Shelf

Flying
Whenever this creature attacks, it gets +1/+1 until end of turn for each other creature you control.

Tokka & Rahzar, Terrible Twos

This spell can't be countered.
Menace
Whenever a player casts a spell, if the amount of mana spent to cast it was less than its mana value, Tokka & Rahzar deal 3 damage to that player.

"You guys don't get sick during time travel, do you?"

Renet, Temporal Apprentice

Flash
When Renet enters, return each other nonland permanent that entered this turn to its owner's hand.

Nobody

When this creature enters, return up to one other target artifact you control to its owner's hand. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

"I am Krang, the All-Powerful! I have never been defeated!"

Krang, the All-Powerful

If a player drawing a card causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
Whenever a player draws their second card each turn, put a +1/+1 counter on Krang.

"I'm going to join the Avatar. And I'm going to help him defeat you."

Valorous Stance

Choose one —
• Target creature gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)
• Destroy target creature with toughness 4 or greater.

Though Sokka believed the toucan-puffins were gathering intel for the enemy, it's far more likely they were simply gathering nesting for their mates.

Toucan-Puffin

Flying
When this creature enters, target creature you control gets +2/+0 until end of turn.

Suki, Kyoshi Warrior

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 attacking.

"Each one is a different kind of weapons specialist. They are also a very capable singing group."
—Iroh

Rough Rhino Cavalry

Firebending 2 (Whenever this creature attacks, add {R}{R}. This mana lasts until end of combat.)
Exhaust — {8}: Put two +1/+1 counters on this creature. It gains trample until end of turn. (Activate each exhaust ability only once.)

Mai didn't always care, but she never missed.

Deadly Precision

As an additional cost to cast this spell, pay {4} or sacrifice an artifact or creature.
Destroy target creature.

By studying the ways of the Waterbenders, Iroh learned how to redirect lightning.

Bolt Bend

This spell costs {3} less to cast if you control a creature with power 4 or greater.
Change the target of target spell or ability with a single target.