Cheapest priced copy (Throne of Eldraine): $2.29 at Card Kingdom, near mint, their price list as of .
Folio of Fancies 
Artifact — Book · Rare · Throne of Eldraine Promos · #46p
Players have no maximum hand size.
{X}{X}, {T}: Each player draws X cards.
{2}{U}, {T}: Each opponent mills cards equal to the number of cards in their hand.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $2.29 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 46 | Rare | $2.29 | $2.49 |
| Throne of Eldraine | 343 | Rare | $3.99 | $7.99 |
| Throne of Eldraine Promos | 46p | Rare | $3.99 | $2.99 |
| Throne of Eldraine Promos | 46s | Rare | — | $3.49 |
| Secret Lair Drop | 2072 | Rare | $5.49 | $5.99 |
3 rulings from Wizards of the Coast
- 4 October 2019It's not possible to pay {X}{X}{2}{U} and activate both abilities of Folio of Fancies. You'll need to find a way to untap it to activate both abilities during one turn.
- 4 October 2019If a player has fewer than X cards in their library, that player loses the game after the first ability of Folio of Fancies resolves. If each player loses the game this way, the game is a draw.
- 4 October 2019To pay {X}{X}, choose a value for X, and pay twice that much mana.