Ureni, the Song Unending — ruling 1

You cannot choose more than X targets for Ureni’s triggered ability. You choose how the damage is divided immediately after choosing those targets. The value of X won’t change even if the number of lands you control changes after that point. That division of damage also won’t change, even if damage can’t be dealt to one or more of those targets as the ability resolves (usually because they’ve left the battlefield).

Ureni, the Song Unending : règles, fonctionnement et interactions (MTG)

Ureni, the Song Unending 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

Flying, protection from white and from black When Ureni enters, it deals X damage divided as you choose among any number of target creatures and/or planeswalkers your opponents control, where X is the number of lands you control.

How it works : Ureni, the Song Unending

Original English text — Wizards of the Coast / Scryfall

#1April 4, 2025· Wizards of the Coast
You cannot choose more than X targets for Ureni’s triggered ability. You choose how the damage is divided immediately after choosing those targets. The value of X won’t change even if the number of lands you control changes after that point. That division of damage also won’t change, even if damage can’t be dealt to one or more of those targets as the ability resolves (usually because they’ve left the battlefield).
No other card is named in this ruling.