This seems easy to answer except I can't see the relation between the answer to the first and the nature of Nexus of Fate. I'm going to guess that you were asking about if the cards all move at once. Yes, they do. So, if Nexus of Fate is discovered in the process of physically doing that, it replaces the event of going into your graveyard with being shuffled into your library (i.e., with your library being shuffled).
This rewrites the past so that you must imagine that the movement, before it occurred, caused Nexus of Fate's ability to apply, which altered the instruction you carried out from [mill all those cards] to [mill all those cards except Nexus of Fate; reveal Nexus of Fate and shuffle it into its owner's library].
If you weren't asking about if the cards all move at once, you'll have to educate me: What would it mean, to mill half your library, by that not being a set number you mill?
Private Mod Note
():
Rollback Post to RevisionRollBack
Epic banner by Erasmus of æтђєг.
Awesome avatar provided by Krashbot @ [Epic Graphics].
I was in a bit of a rush when writing this. They were meant to be related.
If someone plays Maddening Cacophony, and I have 50 cards in my deck, if I mill Nexus of Fate on my 10th card (out of the 25 I need to mill), will Nexus count as card #10, shuffle back into my library, then I keep milling (starting from card #11)?
No. Where Maddening Cacophony says "half [a player's] library, rounded up", it means half the number of cards, rounded up, that were in that library before they were milled this way. Thus, read "...instead each opponent mills half their library, rounded up" as "...instead each opponent mills X cards, where X is half the number of cards in that player's library, rounded up".
The cards all move at once. Nexus of Fate is not the 10th card you mill. No card is; they're all the first. Nexus may just be the card in your library tenth from the top.
And, in general, if a replacement effect applies to change an event, there is no corrective action taken to restore the resulting effects to satisfy the original instruction. The original instruction + the game state defines an event; the event is replaced with an alternate event; and the ultimate alternate event is carried out as the satisfaction of the original instruction.
If an effect prevents damage that would be dealt, the damage isn't made to deal the amount that it said it would do anyway. This is the same principle.
Private Mod Note
():
Rollback Post to RevisionRollBack
Epic banner by Erasmus of æтђєг.
Awesome avatar provided by Krashbot @ [Epic Graphics].
If that’s not then case, how do cards like Nexus of Fate work when milling half?
This rewrites the past so that you must imagine that the movement, before it occurred, caused Nexus of Fate's ability to apply, which altered the instruction you carried out from [mill all those cards] to [mill all those cards except Nexus of Fate; reveal Nexus of Fate and shuffle it into its owner's library].
If you weren't asking about if the cards all move at once, you'll have to educate me: What would it mean, to mill half your library, by that not being a set number you mill?
Awesome avatar provided by Krashbot @ [Epic Graphics].
If someone plays Maddening Cacophony, and I have 50 cards in my deck, if I mill Nexus of Fate on my 10th card (out of the 25 I need to mill), will Nexus count as card #10, shuffle back into my library, then I keep milling (starting from card #11)?
See also:
- https://www.reddit.com/r/mtgrules/comments/ss2kxz/jingitaxias_progress_tyrant_maddening_cacophony/
And, in general, if a replacement effect applies to change an event, there is no corrective action taken to restore the resulting effects to satisfy the original instruction. The original instruction + the game state defines an event; the event is replaced with an alternate event; and the ultimate alternate event is carried out as the satisfaction of the original instruction.
If an effect prevents damage that would be dealt, the damage isn't made to deal the amount that it said it would do anyway. This is the same principle.
Awesome avatar provided by Krashbot @ [Epic Graphics].