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Official rulings
5 rulings · in English, source ScryfallExploding Borders will still deal damage even if you don't put a land card onto the battlefield.
2009-02-01 · Wizards of the CoastYou 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.
2009-02-01 · Wizards of the CoastExploding 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.
2009-02-01 · Wizards of the CoastThe 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.
2021-06-18 · Wizards of the CoastDomain abilities count the number of basic land types among lands you control, not how many lands you control or how many of any type.
2021-06-18 · Wizards of the CoastAll printings