I didn't have a chance yet to play SWD in any but the most casual setting - so I'd like to ask the experienced players:
Any card from the hand can be played either for its purpose (if the cost is payed) or for a reroll. How common is the latter? How many cards do you spend for rerolls in a 'normal' game? I guess that the answer depends on the type of deck, battlefield, etc., but there may be some rule of thumb?
(Searching for SWD resources, I can find good advice on deckbuilding, not so much on actual gameplay.)