If the effects you're stacking didn't also have another purpose that'd be true -- but they do. Generally you're stacking several different kinds...
Nimbus can be pretty rough, but there are several ways to deal with it: - Purge! - Stack on enough buffs to push it off. Not too difficult if...
Impenetrable Nimbus is a nice combo with it, but not strictly needed. Armor works too, and even 5 damage for one extra card is well worth it,...
The draw decks are horribly and obviously broken, and in particular the 2nd Demon Charm is massively sleazable. Very hard to be competitive...
Too easy to sell the wrong thing or pick up an equipped item and drop in the shop rather than your inventory. Standard bit of UI, and easy to add.
Separate names with a comma.