Rite of Ruin — ruling 1

First you choose the order for the card types. Then each player in turn order (starting with the active player) chooses one permanent they control of the first card type. Then those permanents are sacrificed at the same time. Then each player in turn order chooses two permanents they control of the second card type. Then those permanents are sacrificed at the same time. Finally, each player in turn order chooses three permanents of the third card type, then those permanents are sacrificed at the same time.

Rite of Ruin — ruling 2

Permanents sacrificed for one card type won’t be on the battlefield to be chosen for subsequent card types.

Rite of Ruin — ruling 3

If any abilities trigger while Rite of Ruin is resolving, those abilities will wait until Rite of Ruin finishes resolving before going on the stack. Starting with the active player, each player puts their abilities on the stack in any order.

Rite of Ruin : règles, fonctionnement et interactions (MTG)

Rite of Ruin 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

Choose an order for artifacts, creatures, and lands. Each player sacrifices one permanent of their choice of the first type, sacrifices two of their choice of the second type, then sacrifices three of their choice of the third type.

How it works : Rite of Ruin

Original English text — Wizards of the Coast / Scryfall

#1May 1, 2012· Wizards of the Coast
First you choose the order for the card types. Then each player in turn order (starting with the active player) chooses one permanent they control of the first card type. Then those permanents are sacrificed at the same time. Then each player in turn order chooses two permanents they control of the second card type. Then those permanents are sacrificed at the same time. Finally, each player in turn order chooses three permanents of the third card type, then those permanents are sacrificed at the same time.
No other card is named in this ruling.
#2May 1, 2012· Wizards of the Coast
Permanents sacrificed for one card type won’t be on the battlefield to be chosen for subsequent card types.
No other card is named in this ruling.
#3May 1, 2012· Wizards of the Coast
If any abilities trigger while Rite of Ruin is resolving, those abilities will wait until Rite of Ruin finishes resolving before going on the stack. Starting with the active player, each player puts their abilities on the stack in any order.
No other card is named in this ruling.