So ive been playing AST a lot, after a while i started changing how i get my cards used. This is a strategy i use during 8-man content.
I ALWAYS value the AoE effect over the others. I wanted my buffs to act like Fey Wind. Cause, i believe a 5% party buff is better that giving a 10-15% buff to just 1 member. I AoE mostly Balance, Arrow, Bole is a bit situational, not exactly sure about the Spear, and sometimes the Spire. I don't AoE Ewer cause the potency's to weak to make a difference. Usually if i have a card like Balance but no AoE up, i put it in the Spread, so when i do get the AoE, i can use it immediately. Otherwise i just give the card i draw to whoever necessary till i get my AoE up.
That's pretty much it. I've been able to tolerate the RNG with this, most of the time it works in my favor.