Leviathan Horned Crab

+1: Draw a card from the top of your library until you draw a land, put it onto the battlefield then put the rest of the cards into your graveyard.
-2: Draw a card from the top of your library until you draw a crab, put it into your hand then shuffle the rest of the cards into your library.
-7: All crabs gain power equal to there toughness along with trample and menace