Historical Rules · 1 February 2012
Rule 708.6c
Official source text from the 1 February 2012 Rules release
If an effect performs a comparison involving multiple characteristics of one or more split cards in any zone other than the stack, each characteristic is compared separately. If each of the individual comparisons would return a "yes" answer, the whole comparison returns a "yes" answer. Example: Void reads, "Choose a number. Destroy all artifacts and creatures with converted mana cost equal to that number. Then target player reveals his or her hand and discards all nonland cards with converted mana cost equal to the number." If a player casts Void and chooses 1, his or her opponent would discard Assault/Battery because the game sees its converted mana cost as "1, and 4." The same is true if the player chooses 4. If the player chooses 5, however, Assault/Battery would be unaffected.