Octo Opus is a uncommon Enchantment card from Unfinity (UNF), collector number 54. Current market price: $0.06 (foil $0.15), TCGplayer market prices via Scryfall.
When this enchantment enters, create a 4/4 blue Octopus Performer creature token named Contortionist with "At the beginning of your upkeep, you may fold this token in half." (It becomes 2/2, then 1/1, ½/½, and so on.) Sacrifice this enchantment: Draw a card and an additional card for each of Contortionist's folds.