If a card or move, i.e. driftblims wind wave, allows you to move supporters from discard pile to deck. Can you only return current supporters, or old trainer cards that are supporters also?
OK as long as it says Supporter on the card you can return it.
You can not get back the supporter you played this turn.
Why? because that card is not technically discarded until the end of your turn after you attack
and after the effect of the attack