That spell resolves? I'll need more details.

I think it's meant to be "And then that spell resolves"?

So you're postponing a spell (and taxing them casting a second copy of it) until this has been dealt with.

If you have a sac outlet; this potentially could be really interesting for delaying (and making instant) your own spells.

Use Spell Queller's template. You need the chance to pick modes and targets again

I edited the wording to be more explicit, similar to Spell Queller, and put it all into one paragraph because of how clunky the text looks otherwise.

That's one triggered ability? How does that work? An indefinite cost increase?

Maybe if the text looks clunky the design is not viable.

No, it just needs a line break after each period

Which is my point: It needs the line breaks. If you aren't willing to have the line breaks for any, then you have to admit to yourself that the card text is problematic for that reason and have to reconsider something else than the necessary features.

Oh, I missed Brainpolice's explanation. Yeah, that's not a choice you get to make. There's a correct way to template this ability, and you aren't using it yet

Also, the last ability works unintuitively. When you cast the spell from exile, it's no longer exiled, so you don't have to pay the 2 life