I play a lot of Spire and I gotta say that this is quite well executed, although card draws are a little lacking. Having so many 3-cost cards is just hard to do anything. I did get to 4 mana/turn but obviously having so many 2-3 cost cards is playing 1 card per turn even though I skipped the majority of the cards.
This has the potential to be a good game. Good job on the entry.