Phantasmal Image is a mythic Creature — Illusion card from Special Guests (SPG), collector number 67. Current market price: $8.66 (foil $33.37), TCGplayer market prices via Scryfall.
You may have this creature enter as a copy of any creature on the battlefield, except it's an Illusion in addition to its other types and it has "When this creature becomes the target of a spell or ability, sacrifice it."