If I have Nekusar the Mindrazer and Archfiend of Ifnir out at the same time and activate the ability of Jace's Archivist, would the abilities trigger simultaneously because the ability happens all at once or separately because you discard THEN draw?
The Archfiend's ability technically triggers first. However they wait off to the side for the Archivist's ability to finish resolving which will trigger Nekusar. Then after the ability resolves you get to put the waiting abilities on the stack in any order.
When Jace's Archivist's ability resolves, the card discards, if any, happen (making Archfiend of Ifnir's ability trigger as often as called for), then the card draws, if any, happen (making Nekusar's ability trigger as often as called for) (C.R. 608.2c, 603.3). However, even though not all of the abilities just mentioned necessarily trigger at the same time, those abilities will go on the stack at the same time, the next time a player would get priority (here, after Jace's Archivist's ability finishes resolving) (C.R. 117.3b, 117.5, 603.3b). Since in this case you controlled Nekusar and Archfiend of Ifnir when their corresponding abilities triggered, you choose the order those abilities go on the stack (C.R. 603.3b, 113.8).
EDIT (Oct. 25): Edited, including because some rules were renumbered with Core Set 2020.
Okay, that’s the answer I was looking for. One of my friends had an answer for Nekusar where I have to sacrifice a permanent every time I deal damage to them and I wanted to know if I could have Ifnir resolve first on the discard trigger to kill that creature, negating his chance to make me sacrifice. I appreciate the answers
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EDIT (Oct. 25): Edited, including because some rules were renumbered with Core Set 2020.