Put X counters on ~ might work better :)

Probably needs 'as though they were in your hand'.

And... yowie. Could be interesting.

No, it doesn't need "as though they were in your hand" these days. And yay for extracting the interesting "cast your exiled stuff" to a card. Colourless enchantment should really be an artifact though; the flavour differences between them are pretty minimal.

I find this card interesting. The strangest part about this card, though, is how much you should pay when you cast Aether Revival. The correct answer will often be +, since you don't need to remove counters to activate the ability...

Still, I don't think that makes the card bad. The enchantment still requires sacrificing, so it works fine.

Oh my goodness. I just realised what this card is. This is in fact a remake of Ice Cauldron!

You get to save mana from one turn until a later turn, for use on a very restricted set of cards, but on that later turn you get the saved mana plus whatever mana you draw from lands/etc on that turn.

Wow, that's a classic flyspeck-3 card, isn't it? And yeah, it seems a very tempting area to put cards in. Just hard to make simple enough.

Wait, just realized something. X is intended to be used only on exiled cards, not on anything. Wording ideas would be helpful.

And Alex, good call spotting Ice Cauldron; my Magic knowledge doesn't extend back far enough to have spotted that myself.

Hm. You can't just say "Spend that mana only to play exiled cards" without also something letting you do so. Perhaps like Haakon, Stromgald Scourge: "You may cast each exiled card you own this turn if you spend at least one of this mana on that card." or "For each exiled card you own, you may cast that card this turn if you spend at least one of this mana to cast it."

... "If and only if you use this ability then you may spend that mana to play and only to play exiled cards"?

Yeah, no wording is gonna end up short.

Sigh.