Clarion Ultimatum — ruling 1

This spell has no targets. You don't choose five permanents you control until Clarion Ultimatum resolves. If you control fewer than five permanents at that time, choose each permanent you do control.

Clarion Ultimatum — ruling 2

The five permanents you choose must all be different. However, some of them may have the same name as one another. For example, you may choose two Empyrial Archangels and three Plains. If you do, you search your library for up to two more Empyrial Archangels and up to three more Plains and put them onto the battlefield tapped.

Clarion Ultimatum — ruling 3

If you choose a permanent whose name has been changed by an effect (for example, a Clone that's copying another creature), you'll search for a card with the new name, not one with the original name. Note that changing a land's subtype doesn't change its name.

Clarion Ultimatum — ruling 4

If you choose a permanent with no name, such as a face-down creature, no card in your library can be found with that name.

Clarion Ultimatum — ruling 5

You make just one search. (This could matter for cards like Aven Mindcensor, for example.)

Clarion Ultimatum — ruling 6

The cards all enter at the same time. If one of the cards that's entering is an Aura, it must enter attached to a permanent already on the battlefield. It can't enter attached to another permanent entering via Clarion Ultimatum. If an Aura can't enter this way, it remains in your library.

Clarion Ultimatum — ruling 7

If you find a card that isn't a permanent card while searching (for example, you chose an Illusion token and find the split card Illusion/Reality), that card remains in your library.

Clarion Ultimatum : règles, fonctionnement et interactions (MTG)

Clarion Ultimatum 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 five permanents you control. For each of those permanents, you may search your library for a card with the same name as that permanent. Put those cards onto the battlefield tapped, then shuffle.

How it works : Clarion Ultimatum

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2008· Wizards of the Coast
This spell has no targets. You don't choose five permanents you control until Clarion Ultimatum resolves. If you control fewer than five permanents at that time, choose each permanent you do control.
No other card is named in this ruling.
#2October 1, 2008· Wizards of the Coast
The five permanents you choose must all be different. However, some of them may have the same name as one another. For example, you may choose two Empyrial Archangels and three Plains. If you do, you search your library for up to two more Empyrial Archangels and up to three more Plains and put them onto the battlefield tapped.
No other card is named in this ruling.
#3October 1, 2008· Wizards of the Coast
If you choose a permanent whose name has been changed by an effect (for example, a Clone that's copying another creature), you'll search for a card with the new name, not one with the original name. Note that changing a land's subtype doesn't change its name.
No other card is named in this ruling.
#4October 1, 2008· Wizards of the Coast
If you choose a permanent with no name, such as a face-down creature, no card in your library can be found with that name.
No other card is named in this ruling.
#5October 1, 2008· Wizards of the Coast
You make just one search. (This could matter for cards like Aven Mindcensor, for example.)
No other card is named in this ruling.
#6October 1, 2008· Wizards of the Coast
The cards all enter at the same time. If one of the cards that's entering is an Aura, it must enter attached to a permanent already on the battlefield. It can't enter attached to another permanent entering via Clarion Ultimatum. If an Aura can't enter this way, it remains in your library.
No other card is named in this ruling.
#7October 1, 2008· Wizards of the Coast
If you find a card that isn't a permanent card while searching (for example, you chose an Illusion token and find the split card Illusion/Reality), that card remains in your library.
No other card is named in this ruling.