Delirium Skeins — ruling 1

When Delirium Skeins resolves, first the player whose turn it is chooses three cards to discard, then each other player in turn order chooses three cards to discard, then all of those cards are discarded simultaneously. No one sees what the other players are discarding before deciding which cards to discard.

Delirium Skeins : règles, fonctionnement et interactions (MTG)

Delirium Skeins 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

Each player discards three cards.

How it works : Delirium Skeins

Original English text — Wizards of the Coast / Scryfall

#1March 14, 2017· Wizards of the Coast
When Delirium Skeins resolves, first the player whose turn it is chooses three cards to discard, then each other player in turn order chooses three cards to discard, then all of those cards are discarded simultaneously. No one sees what the other players are discarding before deciding which cards to discard.
No other card is named in this ruling.