Hi Monkeybuttorama!
Thanks for your suggestion. Right now I think that there are not much heroes to help with the end-game (at this point the towers themselves are so OP that the hero doesn't even matter anymore). I could think of the horadric mage to gather cards faster.. But maybe I'm overseeing some options here :-D. Maybe you can give some examples?
Any more opinions on this card idea? Would you like to have this option to switch your hero?
I gave your question a few days of thought, Andy, and I don't think I'm creative enough with regards to mechanics for that, but... perhaps a hero that has multicrit or enhances potion effects (both newly consumed and those already used) or perhaps a way to equip one additional item per tower or something along those lines (though I think that might be overly difficult to implement) or perhaps one which increases attack speed/crit/damage in relation to tower level, rather than a set amount
(Mind you, I don't know if any of these already exist; I haven't unlocked everything or whatever, so please excuse if I'm giving suggestions you've already implemented or discounted)
Thanks for sharing! Enhancing potion effects is a cool idea, but will be really hard to balance in order not to make it the OP hero everyone would go for. Cause whatever carry you take, quite a LOT of its damage is buffed by potions over time.
I like the idea of one more item slot...
That, plus one or two strong drawbacks, and we would have an amazing, new legendary hero :-)