Tapper

Cards that neutralize an opponent's creature for a turn by tapping it or keeping it tapped. Gideon's Lawkeeper and Master Decoy tap a creature on demand, Icy Manipulator taps any permanent, Azorius Guildmage does it off mana, Frost Breath and Frost Titan freeze (tap and skip the next untap step), Frost Lynx taps on entering, Elven Raft-Steerer taps on landfall, and Sleep or Blinding Light tap a whole board. The Limited tapper and the blue freeze package answer the same question for a pilot: what holds an attacker or blocker down without removing it? Distinct from Pacifism, which locks a creature for as long as an enchantment stays (Claustrophobia, Pacifism); a one-turn freeze belongs here and a permanent lock belongs there, and Dungeon Geists carries both. Distinct from Pillow Fort, which deters attacks on the player, and from Untapper, the untap side of the same mechanic. Tapping your own creatures as a cost (convoke, Springleaf Drum) does not count.