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Many Avatar: The Last Airbender cards pay you off for having lesson cards in your graveyard like Iroh, Grand Lotus or Ran and Shaw

They spend a good chunk of the game catching frogs in Qu's Marsh (there's even a golden frog sidequest), while their main battle ability is actually "Eat" - consuming weakened enemies to learn Blue Magic (enemy skills)

They also bring game-changing effects

Not understanding sizes could leave you vulnerable to fake cards

Mana produced by Creeping Peeper's activated ability can be used to pay morph or disguise costs when turning a face-down permanent face up or to pay costs associated with turning a manifested or cloaked permanent face up