Fear of Missing Out is a rare Enchantment Creature — Nightmare card from Duskmourn: House of Horror Promos (PDSK), collector number 136s. Current market price: — (foil $6.73), TCGplayer market prices via Scryfall.
When this creature enters, discard a card, then draw a card. Delirium — Whenever this creature attacks for the first time each turn, if there are four or more card types among cards in your graveyard, untap target creature. After this phase, there is an additional combat phase.