T-45 Power Armor

The trade the tap-down enforces is the entire pitch: equip this and your creature swings for +3/+3, but it will not untap on its own again. The energy is the release valve. Two counters come stapled to the Equipment on entry, and each upkeep you can spend one to untap the creature and stamp it with a keyword of your choosing (menace, trample, or lifelink), a slow accrual over two turns that turns a static buff into a growing threat before the reservoir runs dry. What makes the design worth studying is that it fuses two mechanics that usually live apart: a tap-down that would normally read as a Pacifism-style downside, repurposed here as the cost of a resource engine that hands out permanent evasion and reach. The two-counter ceiling is the hard limit. Once both are gone, you are back to a creature that never untaps unless something else does it for you, so the card quietly asks to be built alongside other energy sources rather than run in isolation. As a piece of crossover flavor, the untap-cost framing reads like powering up a suit: the armor is heavy and immobilizing until you feed it, and every counter you pay makes the wearer more dangerous. The mechanical shell is doing real narrative work, which is rarer than it looks in Equipment design.