Convert to Slime is a rare Sorcery card from Duskmourn: House of Horror Commander (DSC), collector number 37. Current market price: $0.30, TCGplayer market prices via Scryfall.
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.