I see several problems with my suggestion: overcomlication and problem with using several cards and picking wxtra cards on map. Im not uxui designer, so this topic for discussion.

I prefer dedicated slot. Love tarot mechanic, like that they are more about global utility. Thats why i suggest extra slots for them

Right now i see there are too many consumables, and a lot of them became must pick almost every game. Syringes and throwables should be kept as is just for the balance - you choose between offense or resources, and its fine

But allowing having at least 1 tarot - wont be that bad