The mana cost and mana value of strive spells don't change no matter how many targets they have. Strive abilities affect only what you pay.
Cruel Feeding
If a spell or ability allows you to cast a strive spell without paying its mana cost, you must pay the additional costs for any targets beyond the first.
If such a spell is copied, and the effect that copies the spell allows a player to choose new targets for the copy, the number of targets can't be changed. The player may change any number of the targets, including all of them or none of them. If, for one of the targets, the player can't choose a new legal target, then it remains unchanged (even if the current target is illegal).
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Jason A. Engle
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