Numot, the Devastator — ruling 1

You choose the targets when the ability is put on the stack, and you choose whether to pay when it resolves. You may choose zero targets. You can pay the mana even if you chose zero targets.

Numot, the Devastator : règles, fonctionnement et interactions (MTG)

Numot, the Devastator 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 Whenever Numot deals combat damage to a player, you may pay . If you do, destroy up to two target lands.

How it works : Numot, the Devastator

Original English text — Wizards of the Coast / Scryfall

#1February 1, 2007· Wizards of the Coast
You choose the targets when the ability is put on the stack, and you choose whether to pay when it resolves. You may choose zero targets. You can pay the mana even if you chose zero targets.
No other card is named in this ruling.