cr:9.2.3

When a split-card is put onto the stack, the player that puts it there chooses one of its two sides.[5.1.2c] For the remainder of its existence, it is considered to have only the name, typebox, and textbox of the chosen side. The other side’s name, typebox, and textbox are considered to not exist.

Example: Comet Storm||Shock is a split card. If the player chooses the left side, the card only has the name Comet Storm, the typebox “Wizard Action,” and textbox “Deal 5 arcane damage to any target.” If the player chooses the right side, the card only has the name Shock, the typebox “Lightning Instant,” and textbox “Deal 1 arcane damage to any target.”