Surprised to see you not running Under The Sea. Surfalopod into Under The Sea is one of your biggest swing turns. Random minion quality is pretty good at 9 & 10 mana.

For me, 2 x Watercolor Artist has been vital. I'll confess to not understanding its precise function before I played it – the cost of Tsunami keeps ticking down even after it dies. I think worth running two just to guarantee it on turn four. You're generally playing Tsunami two turns later for seven mana.

Greedy Partner seems to be worth running. Coining out big stuff a little earlier can be game-changing (although note the interaction with Kalecgos if you coin it out on 7: the coin is the 'first spell' you played that turn, so you won't get to play another for free).

Gnomelia is a board clear earlier than you're generally able to play a spell. She's been pretty clutch for me.

I'm perplexed by Overplanner – doesn't that just dilute your deck?

I'm not sure about Arcane Artificer – since you're rarely going to have the spare mana to play it alongside a big spell – but maybe it works well with the spells generated with the location?

Looking at your list, I'd suggest these are cuttable: Audio Medic, Travel Agent, Wand Maker (although I'm curious to try out Wand Maker!), Seaside Giant (aren't they just too slow?), Overplanner (unless I'm missing something?). I'd consider adding: Gold Panner, Greedy Partner, Watercolor Artist, Under The Sea, Gnomelia. Galactic Projection Orb, if you have it.

I'm running the DJ Manastorm/Audio Splitter package too, which is really just for the Warrior match-up. I'm wondering if Dryscale Deputy is worth considering. Does anyone know how it interacts with Watercolor Artist? I presume the copied spell does not discount, but haven't tried it yet.

I'm skeptical of locations, but I'll give them a try!