Awesome! I'm glad you like the updates :)
I don't think the gold/shop system will work for this game for a couple reasons.
1. If people are playing locally, there won't be enough screen space for everyone to use the shop in a timely manner.
2. The current draft system rewards losing players by letting them draft first (keeping the game closer) whereas the gold/shop system rewards the players that are already winning.
However! I'm currently thinking for online ranked that there will be a build system you set up ahead of time which will include your spell loadout / perks / items / etc. You'll be able to create several loadouts and select which one you want to use before a match. And you'll have to unlock these spells / perks / items by playing the game. Also I'm currently planning to add another 42 spells to the game (6 more elements) so there will be a lot more variety to the game.
Thanks for the ideas!
-Brett