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Card Details
Domain — Creatures can't attack you unless their controller pays 
for each creature they control that's attacking you, where X is the number of basic land types among lands you control.
Illustrated by Alan Rabinowitz
Rulings (4)
Feb 1, 2007
In the Two-Headed Giant format, you still only have to pay once per creature.
Feb 1, 2014
Unless some effect explicitly says otherwise, a creature that can't attack you can still attack a planeswalker you control.
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
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.