The Cosmic Whale Sharks

+1: Create a token that's a copy of target land you control. Then, if you have four or more nonbasic land tokens, sacrifice a nonbasic land token.
-1: Then next time you would sacrifice a land this turn, return it to the battlefield. You may activate this ability any number of times.
-8: You may cast each creature spell with toughness greater than the number of lands you control by paying its mana cost.