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)
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as an overload cost), add any cost increases, then apply any cost reductions
Many Avatar: The Last Airbender cards pay you off for having lesson cards in your graveyard like Iroh, Grand Lotus or Ran and Shaw
8 Animal Sanctuary There's finally a reason to cram all the best Dogs, Cats, Goats, Oxes, Birds, and Snake creature cards into one deck: Animal Sanctuary
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