Heart of Bladehold

Action - Destroy this: You may activate your second sword attack this turn without paying its

cost. Go again

Battleworn

Rulings

From the Mastery Pack Warrior release notes

Heart of Bladehold’s first ability creates an effect that allows you to activate your second sword attack this turn without paying base cost for activation. When you activate the second sword attack and choose to use this effect, the base cost is set to 0.Then, any effects that increase resource costs are applied, followed by effects that decrease resource costs (e.g. Frostbite). You must still have the necessary action points for this activation.
The second sword attack does not have to be the second attack activation from a single source. For example, if you control two 1H swords then your second sword attack could be the first time you activate your second sword.

Keyword notes

Battleworn - Equipment that wear down after each time they are used to defend. If you defend with a card with Battleworn, put a -1{d} counter on it when the combat chain closes.

When you defend with a card it remains on the combat chain until the chain closes, therefore you cannot defend with an equipment multiple times on the same combat chain.
A -1 counter stays on the card until the card is destroyed or the game ends.
If the defense of a card that is defending is below zero, its defense value is considered to be zero.
When this card is destroyed, it is sent to your graveyard. (Not when it has 0)
When this card is destroyed, it is sent to your graveyard.
If the defense of a card that is defending is below zero, calculate as if its defense is zero.

All keywords

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)