702.100. Fuse
702.100a Fuse is a static ability found on some split cards (see rule 708, “Split Cards”) that applies
while the card with fuse is in a player’s hand. If a player casts a split card with fuse from his or
her hand, the player may choose to cast both halves of that split card. This choice is made before
putting the split card with fuse onto the stack. The resulting spell is a
fused split spell.
702.100b A fused split spell has two sets of characteristics a
nd one converted mana cost. The
converted mana cost of the spell is a number equal to the total amount of mana in its two mana
costs, regardless of color.
702.100c The total cost of a fused split spell includes the mana cost of each half. (See rule 601.2e
.)
702.100d As a fused split spell resolves, the controller of the spell follows
the
instructions of the
left half and then follows the instructions of the right half.