How Often Can an Effect be used?

[MunchkinMan]

It depends on the effect, of course. You can use the Cleric's effect any time you are drawing at least one face-up card. However, Hoard gets discarded AFTER you're done drawing those cards, not before, so Hoard won't be on the top of the discard pile until after you've drawn and this idea you've had (already debunked in the FAQ, which is always worth a read), won't work.