Cheapest priced copy (Duskmourn: House of Horror): $0.35 at Card Kingdom, near mint, their price list as of .
Monstrous Emergence 
Sorcery · Common · Duskmourn: House of Horror · #191
As an additional cost to cast this spell, choose a creature you control or reveal a creature card from your hand.
Monstrous Emergence deals damage equal to the power of the creature you chose or the card you revealed to target creature.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror | 191 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 20 September 2024If you chose a creature on the battlefield, use that creature's power when Monstrous Emergence resolves to determine how much damage is dealt. If that creature is no longer on the battlefield when Monstrous Emergence resolves, use that creature's power as it last existed on the battlefield to determine how much damage is dealt.