Dimenxxional Gateway (Yellow)

Opt 2

Reveal the top card of your deck. If it's a Runeblade card, deal 1 arcane damage to each opponent. If it's a Shadow card, you may banish it.

Go again

Rulings

From the Monarch release notes

If it is a Shadow and a Runeblade card, you do both effects. If it is not a Shadow or a Runeblade card you do none of the effects.
If there are no cards in your deck, you reveal nothing. No effects will trigger.
Each opposing hero decides if they want to prevent the arcane damage they would take. They cannot prevent arcane damage that would be dealt to other heroes.
In a multiplayer game, opposing heroes decide if they want to prevent arcane damage in clockwise order, starting with the player to the left of the controller of Dimenxxional Gateway. (This is for a multiplayer game only. Cards that deal damage to both players do not follow this rule in games of two players.)

Keyword notes

Opt X - Opt X is a keyword that allows you to look at the top X cards of your deck and put any number of them to the top or bottom of your deck in any order.

The number of cards you place on top and bottom of your deck is known to your opponent, the order of the cards are not.
You may put all of the cards on the top or all of the cards on the bottom if you so wish.
You may put all of the cards on the top or all of the cards on the bottom if you wish.

All keywords

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)