Gaberon, the Chain Breaker

Whenever a nontoken creature enters the battlefield, if it didn't escape, Gaberon, the
Chain Breaker deals 2 damage to that creature.
Gaberon's power is equal to X.
Escape — {x}{b}{r}, Exile X other cards from
your graveyard.
Don't even try to step in his way, or all hell will
be upon you.