Void Grafter

Flash plus protection-on-a-stick is a deceptively pointed package, and the whole design lives in the timing rather than the body. Cast in response to a removal spell or a targeted aura, this blanks the play and leaves a 2/4 blocker behind: the hexproof grant resolves before the threat does, so the answer fizzles for lack of a legal target. That is the pitch. It is a counterspell that only counters spells aimed at your own board, folded into a creature that adds to it. The protection is also strictly targeted, so it does nothing against an edict that asks you to sacrifice rather than naming a creature. The drawback is structural and intentional: the trigger demands "another target creature you control," so it cannot shield itself, and it does nothing protective the turn you simply jam it on an empty board. Reactive cards that also commit a body are rare because the two jobs pull against each other (you want to hold up the answer, but you want the creature down early), and flash is what reconciles them, letting you bank the mana and decide on the opponent's turn. The colorless devoid frame ties it to the Eldrazi shell it was built for, where the goal was protecting an expensive ramp payoff long enough to win, but the function generalizes anywhere a deck stakes the game on one threat surviving a single targeted removal spell.