Equipped Supreme Leader gets "Reserves: When the battle phase starts, you may pay 3 Force. If you do, choose one of your unique units in any arena. The chosen unit gets +1 power and Inspiration until end of turn."
Keywords
Equip
Equip: A selective effect on Equipment activated during the build step that means, "Attach this Equipment to a unit. Play only during your build step." You can pay the Equip cost only once per turn.
Inspiration
Inspiration: An isolated, static ability that means, "Each of your other units in this arena gets +10 speed, +1 power, and +1 health."
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.)