Nezumi Shadow-Watcher

Hate aimed at a single creature type, and the design honesty of it is rare: the card commits everything to one job and refuses to pretend otherwise. The sacrifice clause spends its whole self to answer one creature, and the target line restricts it to Ninjas specifically, so it sits idle when nobody across the table is sneaking attackers in through the back. The narrowness is the entire bet. Ninjutsu earns its tempo by returning an unblocked attacker to its controller's hand and dropping a Ninja onto the battlefield already attacking, carrying a combat-damage trigger it has not yet cashed. Because this ability fires at instant speed, it slots into the window between that arrival and the combat-damage step: let the Ninja appear, then destroy it before damage resolves, denying the trigger entirely and taking the swap off the table. A 1/1 dies cheaply, so trading it for a freshly arrived Ninja that just bounced a card back to hand is rarely a loss, and the rate is tuned to the one moment that matters. As metagame engineering it belongs to the oldest tradition in the game: the dedicated tribal hoser printed alongside the very mechanic it hates, the logic that yields a card mattering only when one specific archetype shows up across the table. Outside that matchup it is a one-power body with a dead button. The interest is in how surgically it is pointed at a single mechanic and asked to do nothing else.