Cement Shoes

The +3/+3 reads like the payoff and is really the setup: a creature carrying this Equipment gets its stat boost, swings once, then taps at your end step and won't untap during your untap step as long as the gear is attached. The buff buys exactly one meaningful swing before the body sits down, which is the whole trade the design asks you to make. You are spending a creature's entire future on a single oversized attack, which sounds like a bad rate until you notice what the reusable Equipment frame does with it. Older tap-down effects committed to one victim: Icy Manipulator paid its activation each turn to hold something down, and pacifism-style auras stapled themselves permanently to a single target. The static restriction here only bites while the Equipment is attached, so lifting it and moving it lets the previous creature untap normally on your next turn; the lock travels with the gear rather than leaving a trail of benched bodies behind it. The catch, the thing that keeps it from being an opponent-facing prison, is that Equip only attaches to a creature you control and only at sorcery speed, so the lockdown is always self-inflicted. The natural line is to strap it on for a burst of damage you need right now, accept the one-turn tap as the price, then relocate the boost next turn to strike again. The flavor is the cleanest part: sinking the target in concrete, big and menacing but frozen upright, until you fish it back out.