Zuk, Lord of the Inferno

Boss (When this creature dies, if it had no phase II
counters on it, put a phase II counter on Zuk instead)
At the beginning of each upkeep, Zuk fights
target creature of an opponent's choice.
Whenever Zuk is dealt damage, exile that many
cards from the top of your library. If Zuk has a
phase II counter, you may cast those cards
without paying their mana cost.