Cheapest priced copy (Fallout): $4.99 at Card Kingdom, near mint, their price list as of .
Mystic Forge 
Artifact · Rare · Core Set 2020 · #233
You may look at the top card of your library any time.
You may cast artifact spells and colorless spells from the top of your library.
{T}, Pay 1 life: Exile the top card of your library.
Legal inCommanderPioneerModernLegacy
Restricted inVintage
Not legal inBrawlStandardPauper
14 printings · $4.99 to $39.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Warhammer 40,000 Commander | 246 | Rare | $6.49 | — |
| Warhammer 40,000 Commander | 246★ | Rare | — | — |
| The Brothers' War Retro Artifacts | 36 | Mythic | $6.49 | $17.99 |
| The Brothers' War Retro Artifacts | 99 | Mythic | $11.99 | $39.99 |
| The Brothers' War Retro Artifacts | 99z | Mythic | — | — |
| Commander Masters | 964 | Rare | $5.49 | — |
| Core Set 2020 | 233 | Rare | $6.49 | $8.99 |
| Modern Horizons 3 Commander | 302 | Rare | $5.49 | $8.99 |
| Fallout | 236 | Rare | $4.99 | $7.99 |
| Fallout | 484 | Rare | $7.49 | $11.99 |
| Fallout | 764 | Rare | — | $11.99 |
| Fallout | 1012 | Rare | — | $9.99 |
| Core Set 2020 Promos | 233p | Rare | $6.49 | $11.99 |
| Core Set 2020 Promos | 233s | Rare | — | $11.99 |
6 rulings from Wizards of the Coast
- 12 July 2019Because you never "cast" a land card, Mystic Forge doesn't allow you to play an artifact land from the top of your library.
- 12 July 2019Mystic Forge lets you look at the top card of your library whenever you want (with one restriction—see below), even if you don't have priority. This action doesn't use the stack. Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand.
- 12 July 2019You still pay all costs for a spell you cast from your library, including additional costs. You may also pay alternative costs.
- 12 July 2019You must follow the normal timing permissions and restrictions of the spells you cast from your library.
- 12 July 2019If the top card of your library changes while you're casting a spell, playing a land, or activating an ability, you can't look at the new top card until you finish doing so. This means that if you cast the top card of your library, you can't look at the next one until you're done paying for that spell.
- 12 July 2019If the top card of your library has a morph ability, you can cast it face down from the top of your library, even if it's normally not a colorless card.