Rix Maadi, Dungeon Palace — ruling 1

When the second ability resolves, first the active player chooses a card to discard, then the nonactive player chooses, then all chosen cards are discarded at the same time. No one sees what the other players are discarding before deciding which cards to discard.

Rix Maadi, Dungeon Palace : règles, fonctionnement et interactions (MTG)

Rix Maadi, Dungeon Palace 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

: Add . , : Each player discards a card. Activate only as a sorcery.

How it works : Rix Maadi, Dungeon Palace

Original English text — Wizards of the Coast / Scryfall

#1May 1, 2006· Wizards of the Coast
When the second ability resolves, first the active player chooses a card to discard, then the nonactive player chooses, then all chosen cards are discarded at the same time. No one sees what the other players are discarding before deciding which cards to discard.
No other card is named in this ruling.