The Ranger

Whenever another creature you control enters
the battlefield or dies, if that creature's power is
greater than The Ranger's, put a +1/+1 counter
on The Ranger.
As long as The Ranger has three or more +1/+1
counters on it, it has first strike.
"If you please, Mr. Baggins, I should like a quiet
word with you." - Strider