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:
ExileTo exile an object, move it to the exile zone from wherever it is. See rule 406, “Exile.” (CR 701.13) target card from an opponent's graveyard. If it's a creature card, draw a card.
At the beginning of your upkeep, if there are four or more creature cards exiled with this artifact, flip a coin. If you lose the flip,
sacrificeTo sacrifice a permanent, its controller moves it from the battlefield directly to its owner’s graveyard. A player can’t sacrifice something that isn’t a permanent, or something that’s a permanent they don’t control. Sacrificing a permanent doesn’t destroy it, so regeneration or other effects that replace destruction can’t affect this action. (CR 701.21) this artifact and return a card exiled with it at random to its owner's hand.