Minimus Containment is a common Enchantment — Aura card from Adventures in the Forgotten Realms (AFR), collector number 24. Current market price: $0.27 (foil $0.36), TCGplayer market prices via Scryfall.
Enchant nonland permanent Enchanted permanent is a Treasure artifact with "{T}, Sacrifice this artifact: Add one mana of any color," and it loses all other abilities. (If it was a creature, it's no longer a creature.)