Aether mark is a huge waste as it'll produce mostly useless quanta. Current deck would use Fire mark.
With Minor Phoenixes in the deck the AI will constantly buff them since they come out much earlier than the dragon. If you only want to buff Dragons, you can only pack Dragons. That's how the AI works. Your current deck is lacking a lot of offensive power that it could afford to pack, and it has zero utility to deal with the things its opponent will draw due to Shard of Bravery. In other words, it won't do well.
I can see you're low on upgrades in general, and that it seems like you're in Gold. The first stat you want in basically all your decks is Dexterity. Double draw and double deck is insanely powerful. Second most powerful are HP and upgrades; which one it'll be depends on the deck. Be careful with SoBe in the hands of the AI as it's a double-edged sword. With Dexterity you usually don't want to pack more than 2 SoBe, which turns into 4.
