Imprint — When this artifact enters, you may exile a nonland card from your hand.
Spells you cast that share a card type with the exiled card cost less to cast.
Whenever an Equipment you control enters, you may draw a card.
Metalcraft — Equipment you control have equip as long as you control three or more artifacts.
, Unattach Razor Boomerang: It deals 1 damage to any target. Return Razor Boomerang to its owner's hand."
Equip 
as long as you control three or more artifacts.
