Raccoon Rallier

The tap symbol and the "activate only as a sorcery" clause are doing the same balancing job from two directions, and together they define what kind of haste engine this is. The sorcery restriction means you cannot hold up the ability as a threat, and the tap cost means one activation per turn: haste for exactly one creature, on your own main phase, once. That combination strips out the abusive lines a cheaper or faster grant would enable. It cannot rush an entire reanimated or tokened-up board into the red zone in a single turn, and it cannot ambush anything, because haste never mattered on defense in the first place. What is left is a slow, honest engine: land a top-end threat, tap this, swing the turn it arrives, and repeat next turn with whatever else comes down. That role (turning every expensive creature into a same-turn attacker) has historically lived on enchantments and pricier artifacts rather than on a 2/2 body you can also just deploy early and attack with. The small stature and the Bard type point to where it wants to sit: a red deck built around threats worth accelerating, one at a time, without paying full mass-haste rates to make its big drops relevant the turn they hit the table.