Maxx, Charged Elemental

Haste
Whenever a creature enters the battlefield under
your control put a +1/+1 on Maxx, Charged Elemental.
When this creature deals combat damage to a
player, exile cards from the top of your library
until you exile a creature with converted mana
cost less than Maxx, Charged Elemental's power.
You may cast that creature without paying its
cost. Put the exiled cards on the bottom of your library in a random order.