Cheapest priced copy (Mystery Booster 2): $0.49 at Card Kingdom, near mint, their price list as of .
Future Sight 
Enchantment · Rare · Modern Horizons · #53
Play with the top card of your library revealed.
You may play lands and cast spells from the top of your library.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
7 printings · $0.49 to $37.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Jace vs. Vraska | 33 | Rare | $0.59 | — |
| Eternal Masters | 50 | Rare | $0.59 | $2.99 |
| Mystery Booster 2 | 122 | Rare | $0.49 | $0.49 |
| Modern Horizons | 53 | Rare | $0.49 | $1.99 |
| Onslaught | 84 | Rare | $2.29 | $37.99 |
| Secret Lair Drop | 1178 | Rare | $2.99 | $3.49 |
| Secret Lair Drop | 2700 | Rare | $2.79 | $2.99 |
4 rulings from Wizards of the Coast
- 14 June 2019You must follow the normal timing permissions and restrictions for the top card of your library and pay its costs. If the card has alternative or additional costs, you may pay those. If the card has any mandatory additional costs, you must pay those.
- 14 June 2019The top card of your library isn't in your hand, so you can't suspend it, cycle it, or activate any of its abilities.
- 14 June 2019If the top card of your library changes while you're casting a spell, playing a land, or activating an ability (most likely because that top card is the card you're playing), the new top card won't be revealed until you finish doing so.
- 14 June 2019If the top card of your library is a land, you may play that land only if you have any available land plays.