
MenaceMenaceCan't be blocked except by two or more creatures., deathtouchdeathtouchAny amount of damage this deals to a creature is enough to destroy it.
When this creature enters, put target creature card with mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing has mana value 4. X counts as 0 except on the stack. 4 or less from a graveyard onto the battlefield under your control with a finality counter on it. That creature gains menacemenaceCan't be blocked except by two or more creatures., deathtouch
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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.