Sigil of Gravespawning (Blue)

Go again

Whenever an aura leaves your graveyard, deal 1 arcane damage to target hero.

At the beginning of your action phase, destroy this.

Rulings

From the Compendium of Rathe release notes

Sigil of Gravespaning’s second abilities trigger each time an object with the aura subtype leaves your graveyard (e.g put from your graveyard into your hand/on the bottom of your deck, banished, etc.). This is a targeted effect: you must target a hero when you add the triggered effect to the stack. When the triggered effect resolves, you will deal 1 arcane damage to that targeted hero.
Sigil of Gravespawning’s second ability will not trigger while it is in the graveyard as its ability is not functional.
Sigil of Gravespawning’s third ability triggers at the beginning of your action phase. You will destroy it when this triggered effect resolves.
Destroying aura tokens (e.g. Runechants, Quicken, etc.) will not cause Sigil of Gravespawning to trigger as the token ceases to exist when it is destroyed instead of being put into the graveyard (and then 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)