You might want to save your time and forfeit immediately as soon as you see:1. Reavers. This brainless deck is extremely linear and not fun to play against in this mode, or ever. The reavers will just keep multiplying every turn with 9,8,7,6,5... power.
2. Cultists. It grows out of control very quickly, and with creature-heavy deck there is very little you can do about it.
There are many original decks in this mode that you will enjoy facing. Have fun!