2022-09-09 : 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.

2022-09-09 : 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.

2022-09-09 : The value of X is determined after you put the lands you searched for onto the battlefield.

2022-09-09 : When searching your library this way, you may find cards that are not basic lands as long as they have one or more of the basic land types. The basic land types are Plains, Island, Swamp, Mountain, and Forest.

2022-09-09 : You may search for two cards with the same basic land type or different basic land types.