A well built northern realms deck is pretty much impossible to beat.
And while the AI DOES know what is in your hand, it doesn't always play its hand properly.
Off the top of my head:
4 spies, Thaler, Djikstra, Stennis, Elf
1 Decoy
1 Scorch
2 Catapults
1 Combat medic
3 Reavers
3 Commandos...