EnlistEnlist represents a static ability and a triggered ability. Enlist means “As this creature attacks, you may tap up to one untapped creature you control that you didn’t choose to attack with and that either has haste or has been under your control continuously since this turn began. When you do, this creature gets +X/+0 until end of turn, where X is the tapped creature’s power.”
Enlist’s static ability represents an optional cost to attack (see rule 508.1g). Its triggered ability is linked to that static ability (see rule 607.2h).
A creature “enlists” another creature when you pay the cost of the creature’s enlist ability by tapping the other creature. Note that it isn’t possible for a creature to enlist itself.
Multiple instances of enlist on a single creature function independently. The triggered ability represented by each instance of enlist triggers only once and only for the cost associated with that enlist ability. (CR 702.154) (As this creature attacks, you may
tapTo tap a permanent, turn it sideways from an upright position. Only untapped permanents can be tapped. (CR 701.26) a nonattacking creature you control without summoning sickness. When you do, add its power to this creature's until end of turn.)
Whenever a creature you control attacks, if it enlisted a creature this combat, the creature that attacked gains
double strikeDouble strike is a static ability that modifies the rules for the combat damage step. (See rule 510, “Combat Damage Step.”)
If at least one attacking or blocking creature has first strike (see rule 702.7) or double strike as the combat damage step begins, the only creatures that assign combat damage in that step are those with first strike or double strike. After that step, instead of proceeding to the end of combat step, the phase gets a second combat damage step. The only creatures that assign combat damage in that step are the remaining attackers and blockers that had neither first strike nor double strike as the first combat damage step began, as well as the remaining attackers and blockers that currently have double strike. After that step, the phase proceeds to the end of combat step.
Removing double strike from a creature during the first combat damage step will stop it from assigning combat damage in the second combat damage step.
Giving double strike to a creature with first strike after it has already dealt combat damage in the first combat damage step will allow the creature to assign combat damage in the second combat damage step.
Multiple instances of double strike on the same creature are redundant. (CR 702.4) until end of turn. If that creature's power is 4 or greater, draw a card.