Art of the Dragon: Blood (Red)

When this attacks, if it is Draconic, it gets go again and the next 3 Draconic cards you play this turn cost

less to play.

Rulings

From the The Hunted release notes

Art of the Dragon: Blood triggers when it resolves on the stack and becomes an attacking card. Whether it is a card with the Draconic talent supertype is checked when this trigger resolves. When the triggered effect resolves, if it is Draconic, it gets go again and the next 3 Draconic cards you play this turn cost less to play.
The cost decrease continuous effect applies only to the next 3 Draconic cards you play this turn, not just the same combat chain.

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)