Nebelgast Beguiler
A repeatable tapper wears its costs on both sides of the ledger: the activation keeps the ability from being free-flowing, and the tap symbol means it can hold down exactly one attacker or blocker per turn cycle. That rate is deliberately conservative, and the 2/5 body is where the design does its real work. A four-toughness-plus wall that survives most combat and burn, combined with an ability that neutralizes the biggest thing across the table, turns this into a soft lock against ground-based aggression: tap a creature before combat to keep it from attacking. The Spirit line has a long history of small evasive fliers, but this one inverts the tribe's usual profile. Rather than chipping in for two in the air, it plants itself and denies the opponent their combat step, a control tool dressed as a creature. The white mana in the activation cost is the quiet constraint that keeps it honest against decks that want to activate it every turn while doing other things; you are always spending a full mana to keep one threat pinned, and the tap means you cannot pin two. It is a patient card built for the grind, the kind of defensive utility that outlasts opponents rather than racing them.

