Goblin Slayer

Whenever Goblin Slayer deals damage to a
Goblin, destroy that creature.
For every attacking or blocking Goblin, Goblin
Slayer gets +1/+1 until the end of the turn.
Has first strike if blocked by Goblin.
If Goblin Slayer enters the battlefield while you
have Goblins under your control or vice-versa,
those Goblins die.
"In the end, the only good goblins are the ones that
never come out of their holes."