Can I cast spells in response to my own Time Stop? For example, let's say Swarm Intelligence is already in play. I then cast Time Stop which then is copied due to Swarm Intelligence. Then, holding priority, I cast Nexus of Fate which is also copied. Finally, I cast Remand which is also copied. I bounce the original Time Stop with the copy of Remand. I bounce the original Nexus of Fate with the original Remand. Take an extra turn after this one with the copy of Nexus of Fate. Finally ending the current turn with the copy of Time Stop. This would allow me to reuse the combo if I had a way to return Remand to my hand from the graveyard during my turn. Basically halting my opponents from doing anything that might shut me down.
Anyway, my main question here is if you can respond to your own Time Stop.
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In my group there's this thing called taking a "Ryan turn."
Yeah, that's my fault...
You can cast instant spells in response to Time Stop as you can do so in response to almost any other spell (C.R. 117.1a). Like any other spell, Time Stop has no effect unless and until it resolves (C.R. 609.1, 608.2c).
However, if you cast a spell right after you cast Time Stop, you have to do so without knowing whether an opponent or any other player will cast an instant spell (including, say, Cancel) or activate an ability in response to Time Stop (C.R. 117.1a-b, 117.7). That's because in general, if you pass right after casting Time Stop, then every other player can decide to pass as well, resulting in Time Stop resolving and thus exiling all spells and abilities on the stack (C.R. 117.4, 117.3d, 716.1b, 608.2). See also this thread.
EDIT: Added "in general" after comment 4 was posted.
Note, that your specific scenario lessens the risk of having your spell resolve by passing, because casting your spell causes a trigger to go on top of it. And while you can respond to the trigger right away, not doing so and everyone passing will only cause the trigger to resolve, which just gives you the copy of your spell. Then however, the active player, which is not you if you cast your spell during another player's turn, gets priority.
Anyway, my main question here is if you can respond to your own Time Stop.
Yeah, that's my fault...
However, if you cast a spell right after you cast Time Stop, you have to do so without knowing whether an opponent or any other player will cast an instant spell (including, say, Cancel) or activate an ability in response to Time Stop (C.R. 117.1a-b, 117.7). That's because in general, if you pass right after casting Time Stop, then every other player can decide to pass as well, resulting in Time Stop resolving and thus exiling all spells and abilities on the stack (C.R. 117.4, 117.3d, 716.1b, 608.2). See also this thread.
EDIT: Added "in general" after comment 4 was posted.
Yeah, that's my fault...
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