Cheapest priced copy (Duskmourn: House of Horror): $0.49 at Card Kingdom, near mint, their price list as of .
Waltz of Rage 
Sorcery · Rare · Duskmourn: House of Horror · #165
Target creature you control deals damage equal to its power to each other creature. Until end of turn, whenever a creature you control dies, exile the top card of your library. You may play it until the end of your next turn.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror | 165 | Rare | $0.49 | $0.79 |
| Duskmourn: House of Horror | 318 | Rare | $0.49 | $0.79 |
| Duskmourn: House of Horror Promos | 165p | Rare | $0.49 | $0.49 |
| Duskmourn: House of Horror Promos | 165s | Rare | — | $0.99 |
4 rulings from Wizards of the Coast
- 20 September 2024If the target creature is an illegal target when Waltz of Rage tries to resolve, it won't resolve and none of its effects will happen. No damage will be dealt, and the delayed triggered ability won't trigger whenever a creature you control dies this turn.
- 20 September 2024Use the power of the target creature as Waltz of Rage resolves to determine how much damage that creature deals to each other creature.
- 20 September 2024You pay all costs and follow all timing rules for cards played with the permission granted by Waltz of Rage's delayed triggered ability. For example, if one of the exiled cards is a land card, you may play it only during your main phase while the stack is empty.
- 20 September 2024The creature is the source of the damage, not Waltz of Rage.