Spreading Mist (Blue)

Your next attack this turn gets go again.

The next time you would create a card with ephemeral this turn, instead create that many plus 1.

Go again

Rulings

From the Compendium of Rathe release notes

When Spreading Mist resolves, it generates a continuous effect that applies to your next attack this turn giving it go again. It also generates a replacement effect that applies to next time you would create a card with ephemeral this turn, instead creating that many plus 1.
If a single event would create two or more different cards with ephemeral (e.g. create a Fang Strike and Slither), you would choose which of those cards to create.

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)