can only upgrade cards in "backpack", not in deck

[oaky180]

I agree
i hate it when i have to take a card out of my deck to upgrade it

[zzz123]

can only upgrade cards in "backpack", not in deck

this is usually the opposite of what i want to do...

ideal setup: add a switch between deck and backpack to the upgrade menu so you can pick a card to upgrade without playing ping-pong with it.

[tycomp]

+1, not sure how it should be implemented, maybe a 'deck', 'card pool' set of buttons on the upgrade screen.  For me, having done few upgrades, it was frustrating to not be able to see in game what an upgrade would do to my cards without pulling them out of the deck.  I realized later that the wiki is another option, but still it would be nice to be able to do it in game.