Goblin Slayer

Menace, deathtouch, vigilance
{r/w}{r/w}: Until end of turn, target creature becomes
a Goblin in addition to its other types.
{x}{r}{r}, {t}: Goblin Slayer deals X damage to X
Goblin creatures on the battlefield.
"... The only good goblins are the ones that never
come out of their stinking holes."
-Goblin Slayer