These 2 are the most powerful decks I've come up with so far:
Regia Solis:
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5ia 5ia 5j2 5j2 5j2 5li 5li 5lk 5lk 5lk 61o 61o 61o 61o 61o 61o 61o 61o 61o 61o 61o 622 622 622 7jp 7jp 7jp 7jp 7jp 80i 8pp
This is just a slightly improved version of the most classical (and outdated) FG-destroyer deck replacing Light dragons with Shard of patience and purify. However it works best against AI4 (roundabout 90% win ratio and 50% EM-ratio)
The Calm before the Storm:
Hover over cards for details, click for permalink
5j2 5j2 5j2 5j2 61o 61o 61o 61o 61o 61o 61o 61o 61o 61o 61o 61p 61p 61p 61p 61p 622 622 622 624 624 624 624 624 624 80i 8pp
This will work only with upped cards, however if I do the math right its incredibly powerful. It can completely shut down any other deck if you have enough silences on the first hand and should be able to finish off an opponent within 6 turns. It has more reliable draws than Regia Solis and silence provides immunity to mass CC and most permanent controls.