Creature — Human Cleric
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Vigilance
Enlist (As this creature attacks, you may tap a nonattacking creature you control without summoning sickness. When you do, add its power to this creature's until end of turn.)
When a player taps a creature for an attacking creature’s enlist ability, that attacking creature gets +X/+0 until end of turn, where X is the tapped creature’s power. This is a triggered ability that goes on the stack immediately after attackers have been declared in the declare attackers step.