Roiling Fissure (Blue)

Destroy an aura with cost X or less, then you may destroy a Seismic Surge you control. If you do, repeat this process.

Go again

Rulings

From the The Hunted release notes

When Roiling Fissure resolves, you must choose which aura with cost X or less to destroy. Then you may destroy a Seismic Surge you control (this is an optional effect). If you do, you may repeat the process
Base cost is the printed cost value on a card. (Located at the top right corner of a card.) The base cost to play this card is X+1.
You cannot choose an aura without a cost property.
You cannot do the optional effect if you are unable to destroy a Seismic Surge.
Destroying a Seismic Surge this way will not trigger its effect.
Each time you repeat the process, you must destroy an aura with cost X or less if able. After doing so, then you may choose whether you want to destroy a Seismic Surge you control.
Destroyed cards go to their owner’s graveyard. If a token is destroyed (leaves the arena), it ceases to exist.

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)