Gather pieces, pwn your enemies!
Play Fencing Coach on a turn before you play your OTK. It's possible to play him on the same turn as Emperor Thaurissan, but remember not to use your hero power (HP) if you play him long before your OTK turn.
Feign Death can be replaced by Terrorscale Stalker. This gives you one less automaton and *only* 64 HP dmg, but it means you do not have to craft the more expensive Feign Death. In most cases only 4 is sufficient (32 HP dmg).