Machinations of Dominion (Blue)

The next Runeblade attack action card you play this turn gets overpower and "If you've played or created an aura this turn, this gets go again."

Go again

Rulings

From the Rosetta + 1st Strike release notes

The gained ability “If you’ve played or created an aura this turn, […]” constantly checks. If you play or create an aura any time before the link step of combat, the attack action card will have go again and you will gain an action point. (e.g. resolve an on-hit trigger that creates a Runechant token)

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)