Perilous Predicament — ruling 1

When Perilous Predicament resolves, first the player whose turn it is (if that player is an opponent) chooses which creatures they will sacrifice, then each other opponent in turn order does the same, then all chosen creatures are sacrificed at the same time.

Perilous Predicament — ruling 2

If each creature an opponent controls is an artifact creature, that player sacrifices only one creature. Similarly, if each creature an opponent controls is a nonartifact creature, that player sacrifices only one creature. If an opponent controls no creatures, that player doesn’t sacrifice anything.

Perilous Predicament : règles, fonctionnement et interactions (MTG)

Perilous Predicament 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 opponent sacrifices an artifact creature and a nonartifact creature of their choice.

How it works : Perilous Predicament

Original English text — Wizards of the Coast / Scryfall

#1February 9, 2017· Wizards of the Coast
When Perilous Predicament resolves, first the player whose turn it is (if that player is an opponent) chooses which creatures they will sacrifice, then each other opponent in turn order does the same, then all chosen creatures are sacrificed at the same time.
No other card is named in this ruling.
#2February 9, 2017· Wizards of the Coast
If each creature an opponent controls is an artifact creature, that player sacrifices only one creature. Similarly, if each creature an opponent controls is a nonartifact creature, that player sacrifices only one creature. If an opponent controls no creatures, that player doesn’t sacrifice anything.
No other card is named in this ruling.