2,750 g
This item page for Runecarver reflects public Arena Mayhem data for patch 26.19.
Unique - Energized:
Moving and basic attacking generates Energize stacks, up to 100.
Unique - Helix:
Dealing damage with an ability generates 30 Energize stacks and triggers the effects of Energized attacks if they are ready (2.5-second cooldown per cast instance).
Helix can trigger Spiral Out since it counts as an Energized effect, thus allowing Spiral Out to trigger from abilities as well.