Fblthp, the Lost is a rare Legendary Creature — Homunculus card from Secret Lair Drop (SLD), collector number 583. Current market price: $7.83 (foil $7.57), TCGplayer market prices via Scryfall.
When Fblthp enters, draw a card. If it entered from your library or was cast from your library, draw two cards instead. When Fblthp becomes the target of a spell, shuffle Fblthp into its owner's library.