Arcane Nullifier X-21

Arcane Nullifier X-21s are elite arcane nullifiers that can be found in the Gnomeregan instance. They can reflect harmful magical spells.

In Hearthstone
Arcane Nullifier X-21 appears as a rare card in the Goblins vs Gnomes expansion of Hearthstone. The flavor text reads: "There was some hard talk between gnome magi and engineers about inventing this mech."