Puresteel Paladin

Oracle Text

Whenever an Equipment enters the battlefield under your control, you may draw a card.

Metalcraft — Equipment you control have equip 0 as long as you control three or more artifacts.

Card Rulings

6/1/2011 You may still activate the Equipment’s other equip ability if you wish.
6/1/2011 Once the equip ability is activated, destroying Puresteel Paladin or causing its controller to control fewer than three artifacts won’t stop it from resolving.