Killing Wave [Promo], part of the Magic: The Gathering Avacyn Restored set, is an Unknown rarity card that currently holds a market value of $7.71. Its unique mechanics allow players to strategically sacrifice creatures, making it a notable choice in various decks. Collectors appreciate its scarcity and thematic relevance within the set, which adds to its overall appeal in the secondary market. Grading data may further influence its valuation among enthusiasts.