Fire Nation Ambushers

Flash (You may cast this spell any time you could cast an instant.)

Bloodchief Ascension

At the beginning of each end step, if an opponent lost 2 or more life this turn, you may put a quest counter on this enchantment. (Damage causes loss of life.)
Whenever a card is put into an opponent's graveyard from anywhere, if this enchantment has three or more quest counters on it, you may have that player lose 2 life. If you do, you gain 2 life.

Fire Nation Sentinels

Whenever a nontoken creature an opponent controls dies, put a +1/+1 counter on each creature you control.

Gilacorn

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Lion Vulture

Flying (This creature can't be blocked except by creatures with flying or reach.)
At the beginning of your end step, if an opponent lost life this turn, put a +1/+1 counter on this creature and draw a card. (Damage causes loss of life.)

Purple Pentapus

When this creature enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
{2}{B}, Tap an untapped creature you control: Return this card from your graveyard to the battlefield tapped.

Capital Guard

Dragon Moose

Haste (This creature can attack and {T} as soon as it comes under your control.)

Explosive Shot

Explosive Shot deals 4 damage to target creature.

Fire Nation Archers

Soldier

Reach (This creature can block creatures with flying.)
{5}: This creature deals 2 damage to each opponent. Create a 2/2 red Soldier creature token.

Fire Nation Soldier

Fire Nation's Conquest

Cruel Tutor

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Iroh, Firebending Instructor

Whenever Iroh attacks, attacking creatures get +1/+1 until end of turn.

Komodo Rhino

Trample (This creature can deal excess combat damage to the player it's attacking.)

Loyal Fire Sage

Ally

Firebending 1 (Whenever this creature attacks, add {R}. This mana lasts until end of combat.)
{5}: Create a 1/1 white Ally creature token.

Avatar: The Last Airbender Eternal