Pain in the Backside (Red)

When this hits a hero, target dagger you control deals 1 damage to them. If damage is dealt this way, the dagger has hit.

Go again

Rulings

From the The Hunted release notes

Pain in the Backside triggers when it hits hero. As this is a targeted effect, the dagger must be under your control when the triggered effect is added to the stack. If you do not control a dagger this triggered effect does not get added to the stack (it does not resolve).
Pain in the Backside does NOT destroy the daggers that are flicked this way.

Keyword notes

Go again - Go again allows multiple actions to be played in a turn when usually playing an action with use up your action point, and therefore end your turn. A card with go again gives the controller of that card or activated ability 1 action point when it resolves.

When an action with go again resolves, its controller gains 1 action point.
Multiple instances of go again on the same card or activated ability do not stack. If a card or activated ability has multiple instances of go again when it resolves its controller gains 1 action point only.
If an action with go again does not resolve, its controller does not gain 1 action point.
You cannot reveal a card with no to Belittle. The card must have a value to its power that is 3 or less. (0 is a value)