This is a good guide. I've played a ton of games as the Warrior, and after messing up the combo a number of times, made a similar table for myself. As the Warrior, I'm looking for bursts of 30 damage for a true OTK. This can be achieved with one giant enemy minion with 7+ HP as OP mentioned, or with 6 HP spread between 2+ minions. If a single minion has less than 3 attack, only 5 HP is required to complete the combo.
There are a number of more novel situations that arise allowing the warrior to complete the OTK without assembling all combo pieces, but generally speaking, the above conditions are what ETC Warriors are looking for.
For what it's worth, I wouldn't be surprised if ETC gets nerfed. Once opponents figure out the combo requirements, games get incredibly uninteractive. The correct play is to continually pass into fatigue.
3
Power creep stone?