352.14. Splitting
352.14.a. If a card specifies that an amount of damage may be split among some number of Units , then each Unit chosen is Targeted.
352.14.b. The Targets are chosen when the spell or ability is finalized on the chain.
352.14.c. A number of Targets can only be chosen up to, and not exceeding, the initial amount of damage available when the spell is played. Example: A player playing a spell that instructs them to "Split 5 damage" may only choose up to 5 units, but may choose fewer.
352.14.d. Each Target is valid, and contributes to Chosen triggers individually.
352.14.e. The choice of how much damage is divided across the split is not decided until the resolution of the spell or ability.
352.14.f. Each Target must receive a valid amount of damage.
352.14.g. Valid damage is a positive integer amount, greater than or equal to 1 damage.
352.14.h. If, at resolution of the spell or effect, there are more Targets than available damage to divide, then the player who controls the effect dealing damage determines which Targets cease being Targets.
352.14.i. Any costs that were paid, or effects that were triggered as a result of those Game Objects being chosen as Targets remain in effect, paid, or otherwise triggered.