Amulet of Oblation (Blue)

Go again

Instant - Destroy this: Until end of turn, target attack action card gets "If this would be put into a graveyard, instead put it on the bottom of its owner's deck." Activate this only if a card has entered a graveyard this turn.

Rulings

From the Everfest release notes

You cannot defend with Amulet of Oblation as it has no defense value. (This is different than if the defense value was 0.)
You can target attack action cards that have been added as defending cards on the combat chain.
You can target cards you do not own or control.

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)