MTG Salvation

I like this idea. "When you use this card to not its intended purpose, it costs way less to cast". The 1Uversion would be a waste of cardboard, so it needs to have the full Time Stop functionality possible. But oh what a fun surprise it can be to, on the very rare occasion you would want to do so, end your turn prematurely for 1U

Yeah, my point was that if all the card did was 1U end your own turn it wouldn't be a good mythic rare slot, and probably wouldn't see play outside of obscure combo decks. But because its variable cost based on function you can put this in a deck hoping to time stop and when you get the opportunity, or when you have EOT triggers to cancel, you can pull out a surprise. You swung in and your opponent had a nasty surprise? Mission Abort 1U.

Yes, there are some uses for the 1U version. You can cancel EOT triggers or even use it as a situational Counterspell.

I like cards that allow for such interactions, so I'm curious to see the fun combos this card enables.

So many uses here because of the huge flexibility granted by the cost reduction. Time Stop was so expensive that it was really only worth using on your opponent's turn. The situations in which you'd use it on your turn were generally not significant enough to justify the cost.

Purphoros, Bronze-Blooded no longer sacrifices your creatures.

Ilharg, the Raze-Boar no longer bounces the creatures it summons.

Mirror March no longer sacrifices your tokens.

Hmm, I think I have a problem. Maybe not every deck needs to be Izzet.

Cool card, like the design.
Not sure what good it is though. Trying hard to think feasible scenario's where the time stop on your turn is useful. I guessed at first as a situational counter on your turn but that would generally only make sense if you are trying to force something through which obviously won't work as your own spell is removed from the stack. All the things I can think of are very fringe or gimmicky (like avoiding end of turn triggers).

This seems the most plausible way to use it yes.
But then again a deck playing this card is most likely to be some sort of flash deck. The only reason i could think of wanting to play this card is some sort of wilderness reclamation deck or flash deck itself.

A harsh counter to flash decks, dropping Nightpack Ambusher on your turn to get with a waiting Brineborn Cutthroat. No wolf, no +1/+1 counters. Just using it as a 1U counterspell if its past your draw step is usable, and there are some obscure combo posibilities.