Can Glasc Mixologist Deathknell play a unit that dies at the same time as Glasc?

Yes, you can play a unit that died at the same time as Glasc Mixologist using its Deathknell ability.

The Ruling

According to the established logic in Riftbound FAQs regarding Deathknell (specifically FAQ #9482 and FAQ #9392), when multiple units die simultaneously, their Deathknell triggers are added to the chain as pending items before the units are moved to the trash. Because the game "remembers" them in the trash once the triggers resolve, you can target a unit that just died with the Deathknell effect of Glasc Mixologist.

Note: This interpretation is based on community-sourced RiftJudge FAQs as no official rule chunk explicitly details the "simultaneous death" interaction, though it is consistent with the established mechanics of how Deathknell handles pending items.

Sequence of Events

1. Simultaneous Death: Glasc Mixologist and another unit (with 3 or less energy) die simultaneously (e.g., due to a board-wide effect).
2. Deathknell Triggers: Both units have Deathknell abilities. These triggers are added to the chain as pending items before the units are moved to the trash.
3. Chain Resolution: You are the controller of these triggers. You choose the order in which to add them to the chain.
4. Resolving Glasc Mixologist: When you resolve the Deathknell trigger from Glasc Mixologist, you are instructed to play a unit from your trash with an energy cost of 3 or less.
5. Playing the Unit: Because the unit that died simultaneously is now in your trash, it is a legal target for the Deathknell effect of Glasc Mixologist. You may play it from your trash to the battlefield, ignoring its energy cost.

Important Nuance: Attacker vs. Defender Whether you can successfully play the unit to a specific battlefield depends on your status at that location:

• If you are the Defender: You already control the battlefield, so you can play the unit there to maintain your control (FAQ #9149).
• If you are the Attacker: You do not control the battlefield until the showdown is resolved and you have successfully conquered it. Therefore, you cannot play a unit to that battlefield during the combat cleanup phase (FAQ #9479).