[+2]: Put two +1/+1 counters on up to one target creature.
[−3]: Target creature you control deals damage equal to its power to target creature you don't control.
[−9]: Creatures you control get +4/+4 and gain trample until end of turn.
If either creature is an illegal target as Vivien’s second ability tries to resolve, the creature you control won’t deal damage.
Vivien’s last ability affects only creatures you control at the time it resolves. Creatures you begin to control later in the turn won’t get +4/+4 or gain trample.