Sauron, Lord of Mordor

Sauron, Lord of Mordor enters the
battlefield tapped and doesn't untap
during your untap step.
Sacrifice another creature: Untap
Sauron and put a +1/+1 counter on it.
Whenever Sauron attacks, destroy target
creature defending player controls, then
put a +1/+1 counter on Sauron.