Cheapest priced copy (Duskmourn: House of Horror): $6.49 at Card Kingdom, near mint, their price list as of .
Fear of Missing Out 
Enchantment Creature — Nightmare · 2/3 · Rare · Duskmourn: House of Horror · #316
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.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $4.99 to $7.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duskmourn: House of Horror | 136 | Rare | $6.49 | $4.99 |
| Duskmourn: House of Horror | 316 | Rare | $6.49 | $6.99Out of stock |
| Duskmourn: House of Horror Promos | 136p | Rare | $6.49Out of stock | $6.99Out of stock |
| Duskmourn: House of Horror Promos | 136s | Rare | — | $7.49Out of stock |
2 rulings from Wizards of the Coast
- 20 September 2024If the target creature is an illegal target as Fear of Missing Out's last ability tries to resolve, it won't resolve and none of its effects will happen. There won't be an additional combat phase.
- 20 September 2024Fear of Missing Out's last ability doesn't give you any additional main phases. This means that you will move directly from the end of combat step of one combat phase to the beginning of combat step of the next one.