Damage per generated card

Accuracy adds 4 damage to each Shiv. Blade Dance creates 3 Shivs, or 4 when upgraded. If all three generated Shivs hit an ordinary target after base Accuracy is active, Accuracy contributes 12 additional damage across those hits. Accuracy+ contributes 18 instead. These are additive examples before enemy defenses, damage modifiers or other triggers.

The extra Shiv from Blade Dance+ also receives Accuracy’s bonus. That makes the upgrade a change to the number of hits as well as the card count. It does not guarantee that every generated card can be used in every situation.

Play order and repeat fights

Play Accuracy before the Shivs whose damage it should increase. A Power drawn after the first generator can improve later Shivs but cannot change attacks already resolved. The deck still needs to survive the setup turn and find another generator for a long fight.

Compare the complete Shiv strategy for Phantom Blades, renewable generation, defense and reasons to avoid adding another payoff before the generators arrive.