Puresteel Paladin is a rare Creature — Human Knight card from Secret Lair Drop (SLD), collector number 1352. Current market price: $42.83 (foil $41.14), TCGplayer market prices via Scryfall.
Whenever an Equipment you control enters, you may draw a card. Metalcraft — Equipment you control have equip {0} as long as you control three or more artifacts.