If you cast a split card with fuse from your hand without paying its mana cost, you can choose to use its fuse ability and cast both halves without paying their mana costs.
Breaking // Entering
On the stack, a split spell that hasn’t been fused has only that half’s characteristics and mana value. The other half is treated as though it didn’t exist.
To cast a fused split spell, pay both of its mana costs. While the spell is on the stack, its mana value is the total amount of mana in both costs.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Mathias Kollros
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
