Cheapest priced copy (Duskmourn: House of Horror Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Convert to Slime 
Sorcery · Rare · Duskmourn: House of Horror Commander · #64
Destroy up to one target artifact, up to one target creature, and up to one target enchantment.
Delirium — Then if there are four or more card types among cards in your graveyard, create an X/X green Ooze creature token, where X is the total mana value of permanents destroyed this way.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $0.69 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror Commander | 37 | Rare | $0.49 | — |
| Duskmourn: House of Horror Commander | 64 | Rare | $0.69 | — |
2 rulings from Wizards of the Coast
- 20 September 2024If you destroy some of your own permanents with Convert to Slime, they'll go to your graveyard in time for their types to be counted for the delirium ability.
- 20 September 2024Use the mana value of the destroyed permanents as they last existed on the battlefield to determine the value of X.