
EmergeEmergeYou may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value. (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.)
When this creature enters, create a 2/2 white Alien creature token. If this creature's emergeemergeYou may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value. cost was paid, instead create X of those tokens, where X is the sacrificed creature's toughness.
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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.