Sabotage Strategist

A defensive creature whose whole geometry punishes attacking into it: the -1/-0 shrinks every creature that comes at you, and because the debuff hits the entire attacking pack rather than a single chosen target, a wide swing gets blunted across the board. Flying and vigilance mean it holds the fort without ever tapping out of the fight, so it defends and pressures on the same turns. That combination does quiet math for the attacker: send a 1/1 into it and the 1/1 deals nothing; send a team and each attacker loses a point, turning what looked like lethal into a survivable turn. The exhaust ability is where the design finds its ceiling. For it commits three +1/+1 counters to itself, a one-shot conversion from wall into a 5/5 flier that flips the same board it was holding back. The single-use restriction is the price: you cannot rebuild this into a mana sink you lean on every turn, so spending the counters is a decision about when the game stops being about defense and starts being about closing. It reads as a control piece that carries its own finisher, folding the "hold the ground, then win" plan into one card rather than the two slots that job usually costs.