Fleecemane Lion

Two colored mana buys a body that already demands an answer on curve, but the design's real hinge is the second bill you can pay later. Pour five mana into the monstrosity activation and the same Cat grows a +1/+1 counter, turns monstrous, and gains hexproof and indestructible at once: now it shrugs off damage, dodges destruction, and cannot be targeted by spot removal. It is not truly untouchable, though, and that limit is where the design stays honest: a global -X/-X, an edict its controller cannot dodge, an exile sweeper, or a non-destruction board wipe all still get there. What the upgrade actually kills is the value of the whole targeted-removal category, and that is enough to rewrite the math on the fair two-drop underneath. The question stops being whether to remove the Lion and becomes whether to remove it now, before the window opens, because once it flips, every point of spot interaction the opponent is holding goes dead. The tension is pure tempo and held mana: the more the controller leaves open, the more the opponent's sequencing warps, since spot answers have to be committed early or wasted. Monstrosity is the lever that converts a curve-out aggressor into a grind-it-out threat wearing the same coat, and which one it is on any given turn belongs entirely to whoever is sitting on the extra five mana.