Aven Fleetwing

The bargain here is plain: four mana buys a 2/2 flier that an opponent simply cannot target, and you supply the payload that turns two evasive points of damage into a clock. Hexproof on an aggressive evasive body is a known headache for the defending player, because it forces them off single-target removal and onto blockers, board wipes, or racing the damage. But the body is kept deliberately small, so the protection never compounds into a runaway threat. That restraint is the price the keyword demands: anything both untargetable and large turns oppressive in a hurry, so the design pays its toll with a modest stat line rather than dressing up an undercosted creature in armor. The card answers a specific problem rather than a wide one: it wants to carry an Aura or a piece of equipment without that investment evaporating to a one-mana removal spell at the wrong moment. Invisible Stalker pushes the same plan harder, stapling unblockable to a cheaper frame; this one trades that down to flying and a slightly bigger body. Flying gets it past ground defenders entirely while still being stoppable only by creatures that can reach the air, which means the few fliers and reach bodies on the other side become the actual question, not the removal spell in hand.