Conduit of Frostburn (UPR125) (UPR)

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

Quell 1 (If your hero would be dealt damage, you may pay [1 - Resource] to prevent 1 of that damage. If you do, destroy Conduit of Frostburn at the beginning of the end phase.)