Bleed Out (Red)

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This costs X less to play, where X is the total damage you've dealt with daggers this combat chain.

Go again

Rulings

From the Outsiders release notes

If a Dagger has dealt damage from Hurl or Flick Knives, it counts towards the amount of damage daggers have dealt this combat chain.
Decreasing the cost to play a card does not decrease the actual cost of the card for the purposes of effects that reference cost.

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)