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Planar Despair
Sorcery
Domain — All creatures get -1/-1 until end of turn for each basic land type among lands you control.
All of Dominaria recoiled as Yawgmoth and his retainers arrived.
Rulings (2)
The basic land types are Plains, Island, Swamp, Mountain, and Forest. Land types other than basic land types (such as Desert) don't contribute to domain abilities.
Jun 18, 2021
Domain abilities count the number of basic land types among lands you control, not how many lands you control or how many of any type.
Jun 18, 2021
Legality
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