Call to Glory

Card textReaction[Reaction] (Play any time, even before spells and abilities resolve.) / As you play this, you may spend a buff as an additional cost. If you do, ignore this spell's cost. / Give a unit +3 Might this turn.

+3 Might at Reaction[Reaction] speed — and free if you spend a buff. A buffed unit turns it into a zero-cost combat trick, but spending the buff costs that unit its +1: make sure the +3 is going where it matters.