
When this enchantment enters, it deals 3 damage to target creature an opponent controls.
Whenever one or more creatures diedieA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., millmillPut that many cards from the top of a library into its owner's graveyard. a card and put a bloodstain counter on this enchantment. Then sacrifice it if it has five or more bloodstain counters on it. When you do, return target creature card from your graveyard to your hand.
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Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.