Heart of Vengeance

Instant - Destroy this: Your next attack this turn that targets Arakni costs

less to play or activate.

Blade Break

Rulings

From the The Hunted release notes

Decreases to resource costs are applied after increases to resource costs. If an effect would increase the resource cost of playing/activating an attack, the decreases would be applied last.

Keyword notes

Bladebreak - Equipment that are fragile and break after being used to defend. If you defend with a card with Blade Break, destroy 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.
When this card is destroyed, it is sent to your graveyard.
The ability becomes a layer on the chain when the combat chain closes.
The Blade Break ability becomes a layer on the chain when the combat chain closes.
The ability goes on the stack when the combat chain closes.

All keywords

TalentDraconic

TypeEquipment

SubtypesChest

Defense1

KeywordsBlade Break

SetsHNT