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Hi, I'm a european crested tit, and a very small punk rocker!
Some spells (e.g. Aurora) read "While prepped, once per turn during your main phase you may do X".
- Can I stack the effects of multiple spells of the same name? E.g. prep 2 Auroras to gain 2 charges per turn while both are prepped.
- During the main phase, if a spell is prepped (applying its while prepped effect), cast with an effect, then prepped again, can I reapply the while prepped effect?
Yes to both questions.
The once per turn is only affecting the card it's written on. Once a spell is prepped, it creates a "memory" of whether it's been used or not. If you send it back to your hand, the memory of the spell resets and when you cast prep it again, it is considered as a new spell with a fresh memory, thus allowing you to use the once per turn ability again.