Dosan the Falling Leaf

Counterspells live in the gap between when you commit a spell and when it resolves, and instant-speed interaction lives in your opponent's turn: end-of-turn draw spells, flashed-in blockers, removal held up to answer your threats. This Monk shuts the whole window. With players able to cast only during their own turns, every interactive deck collapses into a sorcery-speed proposition, which structurally favors whoever is dictating the pace. That is the cleanest read of why it exists: it does not punish reactive play so much as forbid it, turning Magic into a game of who untaps with the better board rather than who holds up the right answer. The lock is symmetrical, but the symmetry is a fiction in practice, because the player building around it never wanted to interact on the opponent's turn anyway. It is the proactive ramp-and-overrun strategy's silver bullet against control, draw-go, and any deck whose plan depends on responding. The fragility is the tax. A 2/2 for dies to nearly anything, and the lock only persists while it lives, so protecting it falls to the same instant-speed tricks the static ability has now switched off for everyone, including its owner. A hard, format-warping lock stapled to a body that begs to be removed immediately: holding those two facts in the same deck is the entire puzzle of building with it.