Conduit of Frostburn

Instant - Destroy this: The next card you play this turn with an arcane damage effect gets "When this deals arcane damage to a hero, destroy a frozen card in their arsenal."

Quell 1

Rulings

From the Uprising release notes

This effect does not apply to activated abilities that deal arcane damage (such as Waning Moon)
If there are multiple frozen cards in their arsenal, you choose which one to destroy. Players may not shuffle or change the positioning of facedown arsenal cards. Players must be able to tell which one was more recent if there are multiple face-down arsenal cards.
Conduit of Frostburn’s ability can be activated on the same turn Quell is used, as Quell will not destroy Conduit of Frostburn until the end of the turn.

Keyword notes

Quell X - If your hero would be dealt damage, you may pay X to prevent X of that damage. If you do, destroy Quell at the beginning of the end phase.

Quell is a static ability that generates a fixed-prevention effect.
The prevention effect is optional. When the effect is applied, the controller chooses whether to pay the amount. If they do, the prevention effect reduces the damage, and creates a delayed triggered-effect that destroys the source object at the beginning of the End Phase.
If another prevention effect reduces a damage event to 0, the replacement condition is no longer met (damage would not be dealt), so Quell would not apply.
The prevention amount applies to a single damage event. The leftover prevention amount does not apply to any future damage that would be dealt to your hero.
If the damage prevention can not be applied due to an effect, the delayed triggered effect is still created as part of the replacement effect application and will still destroy the source at the beginning of the End Phase.

All keywords

TalentIce

ClassWizard

TypeEquipment

SubtypesArms

Defense0

KeywordsQuell 1

SetsUPR