
SoulbondSoulbondYou may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them. (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.)
As long as Mirage Phalanx is paired with another creature, each of those creatures has "At the beginning of combat on your turn, create a token that's a copy of this creature, except it has haste and loses soulbondsoulbondYou may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.. Exile it at end of combat."
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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.