Defeat 12 Master Tamers in Broken Isles with all Mechanical pets:
Nightwatcher Merayl
Tiffany Nelson
Sir Galveston
Grixis Tinypop
Robert Craig
Aulier
Varenne
Xorvasc
Bodhi Sunwayver
Amalia
Bredda Tenderhide
Odrogg
Trapper Jarrun
Master Tamer Flummox
Durian Strongfruit