Glamermite

Flash and flying on a 2/2 is the delivery mechanism; the enters trigger is what you are paying for. The choice between tapping and untapping a creature turns a modest evasive body into a tempo lever that swings in either direction, and the direction is chosen by the moment you flash it in. Tap mode is offense: during your own turn, before attackers are declared, tapping down a would-be blocker clears a path so your board connects (a falter, not a fog, since tapping an already-declared attacker does nothing to stop its damage). It also punishes an untapped blocker your opponent was holding back. Untap mode is the quieter half: flash the Faerie in during your opponent's combat to free up a tapped creature of your own for blocking duty, or reset a mana dork or an ability creature you have already spent. Because both targets are unrestricted, the card scales with whatever is on the table rather than doing a fixed thing. Faeries have long traded in this kind of instant-speed interference, arriving on the wrong turn to break up a plan and leaving an evasive threat behind, and this sits squarely in that lineage: a small Rogue whose value is the timing window, not the stat line. Its single enters trigger means the tempo swing is a one-shot unless something else blinks or bounces it. What it asks is the discipline to hold up three mana and pick the right combat step.