I wil try to explain myself better. If you just wait for balance and arrow it's just better you go scholar so you can sustain party dps and give a small aoe and constant haste to the party.
My co healer is a scholar so my job is solo healing most of the time while the scholar does damage. Sometimes an Ewer on myself can save a mage's ballad or anyway it can posticipate it. In A2 savage we dont change magitek driver so my monk always suffers for tp and this is how i can help. If i get bole and use it on one of my tanks i can say to my co healer to keep on dpsing while i solo heal.
All of the cards can make a difference, a bole used on weak raised ppl, mana to mages and of course also arrow and balance. I agree with ppl Who say that if you use only 2 or 3 cards in a fight you are gimping youself.