Reserves: , Pay 4 Force Prevent 1 damage to one of your units in the Character arena. Retreat that Character. Play only if damage is pending.
Keywords
Reserves
Reserves: [Ability]: A layered, static ability that means, "The following ability works while, and only while, it's in the build zone." The granted ability remains to be the ability of its type. (For example, activated abilities granted by Reserves may be disrupted.)