Jigsaw, Twisted Tormentor

Whenever you equip or enchant an enemy creature, draw a card. This ability only triggers once each turn.
Make your choice — At the beginning of your end step, target enemy player chooses one —
•That enemy player loses 4 life and sacrifices an artifact or enchantment.
•That enemy player has you return a random equipment or aura card from your graveyard to your hand.