Melt into Ichor

Melt into Ichor deals X damage to target
creature, where X is the number of artifacts you control.
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.)