Sandworm — ruling 1

If the target land is an illegal target when Sandworm's last ability tries to resolve, it won't resolve and none of its effects will happen. The target land's controller won't search for a basic land card.

Sandworm — ruling 2

If Sandworm's last ability resolves but doesn't destroy the target land (probably because the land had indestructible), the target land's controller still gets to search for a basic land card.

Sandworm : règles, fonctionnement et interactions (MTG)

Sandworm 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

Haste When this creature enters, destroy target land. Its controller may search their library for a basic land card, put it onto the battlefield tapped, then shuffle.

How it works : Sandworm

Original English text — Wizards of the Coast / Scryfall

#1June 6, 2025· Wizards of the Coast
If the target land is an illegal target when Sandworm's last ability tries to resolve, it won't resolve and none of its effects will happen. The target land's controller won't search for a basic land card.
No other card is named in this ruling.
#2June 6, 2025· Wizards of the Coast
If Sandworm's last ability resolves but doesn't destroy the target land (probably because the land had indestructible), the target land's controller still gets to search for a basic land card.
No other card is named in this ruling.