Rulings
You must discard exactly one land card to cast Magmatic Insight. You can't cast it without discarding a land card, and you can't discard additional cards.
(wotc • 2015-06-22)
Rulings
You must discard exactly one land card to cast Magmatic Insight. You can't cast it without discarding a land card, and you can't discard additional cards.
(wotc • 2015-06-22)