1 Feb 2009
Exploding Borders has only one target: the player. If that player becomes an illegal target by the time Exploding Borders would resolve, the entire spell doesn't resolve. You won't get to search for a basic land card.
1 Feb 2009
You do what the spell says in order, so you'll put a new basic land card onto the battlefield before you determine the value of X.
1 Feb 2009
Exploding Borders will still deal damage even if you don't put a land card onto the battlefield.
18 Jun 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.
18 Jun 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.