Cogwork Tracker

Defender.
When you take damage from source another
player controls, note that player. Cogwork
Tracker can and must attack the noted player
each combat, as if it did not have Defender, if
able. Until the noted player loses the game, no
other player may be so noted.
"I assure you, a living guard hound can neither equal
its might, nor pursue an assailant with its relentless."
- Muzzio, Visionary Architect