Master Decoy

The repeatable tapper, distilled to a clean white shell. Tapping a creature is two answers in one body: tap a would-be blocker on your own turn and your team gets through, or tap a creature before the opponent's combat so it cannot swing into you that turn. The timing discipline is the whole point. To neutralize an attacker you have to spend the activation during their turn, before they declare attacks, because the creature untaps on their next untap step. That makes the lockdown a turn-by-turn negotiation rather than a permanent answer. The cost of W plus the tap is the other piece of the leash: it draws on your mana and the creature's own tap each turn, so the effect is a rationed resource, not free pseudo-removal. The 1/2 body matters more than it looks; one toughness would fall to the smallest reach, but two toughness lets it survive as a recurring threat-defuser that opponents have to spend a real card to kill. This is the lineage white returns to whenever it wants a soft control valve without committing to outright Pacifism effects: a permanent that taxes the board by rationing out a tap each turn, attached to a body cheap enough to deploy early and stick around long enough to matter.