Raging Battle Mouse

A cost reducer that keys off your second spell each turn is a strange lever to build around, because it rewards sequencing rather than raw volume: cast something cheap first so the discount lands on the pricier spell you were saving. Most red two-drops of this rate ask you to attack; this one asks you to keep casting. The Celebration clause bolts on a second incentive to flood the board early, since it fires only when a pair of nonland permanents have entered under your control that turn, and it triggers at the start of combat, so the +1/+1 arrives in time to matter for the swing rather than sitting idle on your end step. That pairing (cast a second spell more cheaply, then get rewarded for having put two things onto the battlefield) points the deckbuilder toward a low curve full of tokens and cheap permanents, where both halves come online on the same turns. The tension is that neither ability does much in isolation: the discount is small and conditional, the buff a single +1/+1 that needs a busy board. Stacked onto a 2/1 body, they describe a creature that only earns its slot inside a go-wide, go-fast shell, which is exactly the archetype it was drawn for.