Fumarole — ruling 1

Fumarole can’t be cast unless you can target both a creature and a land. If there’s a permanent on the battlefield that’s both a creature and a land, it can be both targets.

Fumarole : règles, fonctionnement et interactions (MTG)

Fumarole 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

As an additional cost to cast this spell, pay 3 life. Destroy target creature and target land.

How it works : Fumarole

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2008· Wizards of the Coast
Fumarole can’t be cast unless you can target both a creature and a land. If there’s a permanent on the battlefield that’s both a creature and a land, it can be both targets.
No other card is named in this ruling.

Interactions with other cards

These cards' text mentions Fumarole.

Tundra Fumarole

Tundra Fumarole deals 4 damage to target creature or planeswalker. Add {C} for each {S} spent to cast this spell. Until end of turn, you don't lose this mana as steps and phases end. ({S} is mana from a snow source.)