Bloodthirsty Baloth

Trample
Whenever Bloodthirsty Baloth attacks, if you
control a creature with a greater power than
Bloodthirsty Baloth, Bloodthirsty Baloth gains
+1/+1 until end of turn
When Bloodthirsty Baloth leaves the battlefield,
you may cast any spell from your hand for half
of its mana cost. If you do, you lose life equal to
the number of mana spent this way