Magmatic Insight
Sorcery
As an additional cost to cast this spell, discard a land card.
Draw two cards.
Chief among the tenets of Purphoros is that one must destroy in order to create.
Illustrated by
Magic Origins#155UncommonEnglishLegality
Rulings
Jun 22, 2015
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.