Grim Lavamancer — ruling 1

The two cards are exiled as the cost of Grim Lavamancer's ability is paid. Players can't respond to the paying of costs by trying to move those cards to another zone.

Grim Lavamancer : règles, fonctionnement et interactions (MTG)

Grim Lavamancer 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

, , Exile two cards from your graveyard: This creature deals 2 damage to any target.

How it works : Grim Lavamancer

Original English text — Wizards of the Coast / Scryfall

#1December 8, 2022· Wizards of the Coast
The two cards are exiled as the cost of Grim Lavamancer's ability is paid. Players can't respond to the paying of costs by trying to move those cards to another zone.
No other card is named in this ruling.