Renevex, The Masked Cloak

+1: Renevex, The Masked Cloak does X damage to any target where X is the number of artifacts you control.
-X: Return target artifact with converted mana cost X or less from your graveyard to your hand.
-7: Destroy all artifacts. for each artifact destroyed this way, create a 3/2 colorless construct creature token with Fear and Death touch.