Enchanting Melody (Red)

Go again

If you would be dealt damage, destroy this to prevent 4 of that damage.

At the beginning of your end phase, destroy this unless you have played a non-attack action card this turn.

Rulings

From the Arcane Rising release notes

If you have multiple damage preventions available, you choose which prevention to apply first.
If you are about to take arcane damage you may use arcane barrier to prevent first before this prevention.
Loss of life does not count as being dealt damage.
Enchanting Melody is a ‘non-attack’ action therefore it will prevent itself from being destroyed the turn you play it.

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)