Galvanized Enforcer

When Galvanized Enforcer enters the battlefield,
reforge 4 (You may exile another permanent you
control. If you do, reveal the top 4 cards of your
library and put a permanent card with equal or lesser
mana value than the exiled card onto the battlefield.
Put the other revealed cards at the bottom of your
library in any order.)
When Galvanized Enforcer leaves the battlefield,
it deals 3 damage to target creature.