Card Text:
Soulbond <i>(You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)</i>
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 soulbond. Exile it at end of combat."