There are a lot of problems with this spell. For starters, although this doesn't hit every spell that either Flash Counter or Envelop can hit, it does overlap a great deal with both of them. Thus, I would not cost this any cheaper than


. Two, because countering spells is firmly blue, no matter how steep the alternate casting cost might seem, it needs to somehow enforce that this card is playable only in a blue deck. Whether you achieve that by asking for a player to discard blue cards or islands is up to you (or think of some other alternate casting cost that focuses on blueness.) Three, stack rearrangement is a sticky point. In my opinion, it isn't even really feasible alone on a rare card. You seem to have included it here as an unrelated add-on to a card that really wants to be just a counter.