Break Open the Chests! (Yellow)

Turn all cards in all arsenals face-up. Then if there's a face-up yellow card in any arsenal, create 2 Gold tokens.

Go again

Rulings

From the Compendium of Rathe release notes

When Break Open the Chests! resolves, you will turn all cards in all arsenals face-up. Then, if there is at least one face-up yellow card among all cards in the arsenal, you will create 2 Gold tokens.
When resolving Break Open the Chests!, there is no priority between any of the effects generated (e.g. turning cards face-up, creating Gold tokens)

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)