Being able to build up hands would be a plus, maybe through some kind of rummy-style mechanism where you can pick up others' discards, etc.
Suits having areas of coverage: hearts are for physical well-being, for example, or clubs for violence, or whatever. You get the value of the card only in the area of coverage, otherwise you get a reduced value (say 1) for each card no matter what the value.
Going back to the rummy-style hand-building, combos of cards have special effects. Triples/quadruples. Runs (both in-suit or out-of-suit).
Maybe some assistance mechanism where physical cards are swapped/gifted/whatever.