cleric question

[evikour]

A cleric was being helped in a battle so at the end he had to pick three treasures face up. Could he pick all three from the discard pile or some from the discard pile and some from the regular one?
Lets say he picks the three treasures from discards. Rules say he has to throw a card after picking each card from the discards. Which is the right order?He picks the three treasures at once and then throws away three cards or one pick-one throwing away and so on?This is important because if he picks a Gual Card,can he play it immediately,then discard it and re-pick it to gain another level?Doesn't sound right...