
EnchantEnchantThis Aura can only be attached to the stated kind of object or player. creature
At the beginning of the upkeep of enchanted creature's controller, put a -0/-1 counter on that creature.
When enchanted creature diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., that creature's controller chooses a creature that this card could enchantenchantThis Aura can only be attached to the stated kind of object or player.. If the player does, return this card to the battlefield under your control attached to that creature. If they don't, return this card to the battlefield under your control as a non-Aura enchantment. It loses "enchantenchantThis Aura can only be attached to the stated kind of object or player. creature" and gains "At the beginning of that player's upkeep, this enchantment deals 1 damage to that player."
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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.