Mistcutter Hydra

Of all the colors, green has historically had the fewest honest answers to countermagic, and this is the closest it gets to a threat that cannot be argued with. The uncounterable clause is what walks the spell past a control deck's best line of defense, getting the body onto the battlefield in the first place; only then does protection from blue switch on and do the rest of the work at once, shrugging off bounce, tap-down, blue removal, and blocks from blue creatures. Haste closes the loop, turning the answer into a clock the same turn it arrives. A creature that resolves through interaction and connects immediately is far harder to stabilize against than one that hands the opponent a fresh draw step to find a sweeper. The balancing act lives in the body having no fixed size: it enters as a 0/0 and scales entirely on whatever mana is left over, so against anything that isn't blue it is a fragile, removable thing with none of the protection mattering. The whole anti-blue suite lights up only in the matchup you most need it, which makes the card enormous against one color and merely fine against the rest. That asymmetry is the design: rather than a dead-drawing hate piece, green gets a scalable finisher whose insurance is folded into the same card as the win condition, useful in every game but decisive against exactly the archetype it was cut to shape around.