The Drum, Mining Facility — ruling 1

Ending the turn this way means the following things happen in order: 1) All spells and abilities on the stack are exiled. This includes spells and abilities that can't be countered. 2) If there are any attacking and blocking creatures, they're removed from combat. 3) State-based actions are checked. No player gets priority, and no triggered abilities are put onto the stack. 4) The current phase and/or step ends. The game skips straight to the cleanup step. 5) The cleanup step happens in its entirety.

The Drum, Mining Facility — ruling 2

If any triggered abilities do trigger during this process, they're put onto the stack during the cleanup step. If this happens, players will have a chance to cast spells and activate abilities, then there will be another cleanup step before the turn is over.

The Drum, Mining Facility — ruling 3

Though other spells and abilities that are exiled won't get a chance to resolve, they don't count as being countered.

The Drum, Mining Facility — ruling 4

Any "at the beginning of the next end step" triggered abilities won't get the chance to trigger that turn because the end step is skipped. Those abilities will trigger at the beginning of the end step of the next turn.

The Drum, Mining Facility : règles, fonctionnement et interactions (MTG)

The Drum, Mining Facility is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Whenever you roll the planar die, creatures you control get +1/+1 and gain haste until end of turn. Whenever chaos ensues, end the turn. (Exile all spells and abilities from the stack. The player whose turn it is discards down to their maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects end.)

How it works : The Drum, Mining Facility

Original English text — Wizards of the Coast / Scryfall

#1October 13, 2023· Wizards of the Coast
Ending the turn this way means the following things happen in order: 1) All spells and abilities on the stack are exiled. This includes spells and abilities that can't be countered. 2) If there are any attacking and blocking creatures, they're removed from combat. 3) State-based actions are checked. No player gets priority, and no triggered abilities are put onto the stack. 4) The current phase and/or step ends. The game skips straight to the cleanup step. 5) The cleanup step happens in its entirety.
No other card is named in this ruling.
#2October 13, 2023· Wizards of the Coast
If any triggered abilities do trigger during this process, they're put onto the stack during the cleanup step. If this happens, players will have a chance to cast spells and activate abilities, then there will be another cleanup step before the turn is over.
No other card is named in this ruling.
#3October 13, 2023· Wizards of the Coast
Though other spells and abilities that are exiled won't get a chance to resolve, they don't count as being countered.
No other card is named in this ruling.
#4October 13, 2023· Wizards of the Coast
Any "at the beginning of the next end step" triggered abilities won't get the chance to trigger that turn because the end step is skipped. Those abilities will trigger at the beginning of the end step of the next turn.
No other card is named in this ruling.