Avatar: The Last Airbender

Clue

Instant — Lesson

Exile target artifact, creature, or enchantment. Its controller creates a Clue token. (It's an artifact with "{2}, Sacrifice this token: Draw a card.")

Zuko's Exile

Creature — Serpent

If there are three or more Lesson cards in your graveyard, you may cast this spell as though it had flash.
This spell costs {1} less to cast for each noncreature, nonland card in your graveyard.

Serpent of the Pass

Final Fantasy

Treasure

Zidane, Tantalus Thief

Legendary Creature — Human Mutant Scout

When Zidane enters, gain control of target creature an opponent controls until end of turn. Untap it. It gains lifelink and haste until end of turn.
Whenever an opponent gains control of a permanent from you, you create a Treasure token.