Qurupeco

{2}, {t} : All creatures you control have +2/+0 or
+0/+2 until the end of the turn.
{x}, {t} : You can put a creature with higher
strengh than Qurupeco's from your hand on the battlefield, where X is half its mana cost rounded
down. You may only use this ability if Qurupeco
is your only creature on the battlefield.