I wouldn't really want to see them single target due to Frontlines still being a thing.
However if double cast would interact with the last card played to act powered up single target version of that said card, I'd be quite intrigued. Even though double cast would have too many options if you'd also include the cards, it's still a fun system to play around with.
Would be worth considering if Aspected Benefic would include the last played card effect for 1 person