If I have Glass Mixologist on a battlefield I control and my opponent attacks it with a higher might unit and kills it during combat step, can I play the revived unit to that same battlefield where Glass Mixologist was?

The interaction between Glasc Mixologist and combat resolution is subject to conflicting rulings within the current ruleset. Based on the provided documentation, here is the sequence of events regarding the Deathknell ability.

The Ruling

Yes, you can play the unit from your Deathknell ability to that battlefield.

According to the provided FAQs, the Deathknell trigger allows you to play a unit from your trash to the battlefield where the Glasc Mixologist died. While some interpretations suggest this occurs after combat, other rulings indicate that this unit enters the battlefield in time to participate in the showdown and influence the combat result or maintain control.

Sequence of Events

1. Combat Damage Step: Damage is dealt. Glasc Mixologist takes lethal damage and dies, triggering Deathknell.
2. Resolution Step: The game processes the Deathknell trigger.
3. Unit Entry: You play a unit from your trash to the battlefield.
4. Combat Resolution: The game proceeds to "Determine Combat Result" and "Establish Control." Because the new unit is now present on the battlefield, it is factored into the combat result and the determination of control.

Note: There are conflicting rulings regarding the timing of the Deathknell trigger relative to combat resolution (e.g., FAQ #9524 vs. #8852, #8776, and #9149). I could not fully verify which ruling takes precedence as all provided FAQs are marked as current.