>>97221281I don't know if there's any consensus on the best deck to have yet, but I run an adventure/mystical deck.
Gunslinger Kyle might seem decent at first, but down the road you'll find out he's pretty meh for the energy cost he has.
Calamity Heidi is a pretty damn good card t have, especially because of how little energy she costs.
Sherrif Cartman is a decent tank, but down the road you'll probably get the much better Zen Cartman who, despite not being able to attack at all, has tons of HP and the ability to force surrounding enemies to gang up on him.
Mimsy is okay for PvE and early PvP, but you're not gonna want him in your deck for long, especially because he costs so much energy.
Terrance Mephesto is an amazing card to have in your deck. Is damage output is a little low, but his attack speed is pretty good, his attack has a great AOE and he's an airborne character, which means he can only get hit by ranged fighters
Nathan is good too, but he's just a watered down Terrance since he's a grounded fighter.
So bottomline, you can upgrade Heidi and Terrance all you want, but don't upgrade your other cards too much, because you'll find that ressources grow more and more scarce as you progress.