Oona's Prowler

A 3/1 flier for two mana is an aggressive rate, and the card pays for it with one of the strangest drawbacks in the game: an activated ability that any player, not just the controller, can use to shrink it. The line "any player may activate this ability" turns a beater into shared infrastructure. An opponent can pitch a card from their own hand to drop it to a 1/1 for the turn, and in a board stall that trade can be worth it to them; the shrink wears off at cleanup, so anyone wanting to keep the Prowler small has to feed it a card every turn, paying the leash in cardboard over and over. The discard cost is the real design hook. It does not say "you," and that single omission separates this from a vanilla evasive two-drop. In practice the controller often wants to discard anyway, fueling graveyard payoffs or madness triggers while the creature attacks for one instead of three; reducing its power by two is a cost they were already happy to pay. The faerie's stat line is the lure and the shared ability is the leash, a piece of symmetric design that asks both players, every single turn, to decide how many cards two points of flying power are worth.