Amulet of Intervention (Blue)

Go again

Instant - Destroy this: Prevent the next 1 damage that would be dealt to you this turn. Activate this only while your hero is the target of a source that would deal lethal damage.

Rulings

From the Everfest release notes

You cannot defend with Amulet of Intervention as it has no defense property. (This is different than if it had a defense value of 0.)
This prevents all types of damage including damage from attacks, arcane damage and damage. This does not prevent loss of life.
If your were to increase after the activation of Amulet of Intervention the activated layer and its effect would still resolve.
An attack or action card is considered to have ‘targeted’ your hero when the card is played, and ability is activated, or a triggered layer is added to the stack, announcing the target.
The source would deal damage to you if the resolution of that source as a layer on the stack would produce an effect that deals damage to your hero; or if the current chain link would deal damage, during the damage step of combat (taking into account the current defending cards), to your hero. Replacement effects, including prevention effects, are not considered for this condition to be met.

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)