Cheapest priced copy (Ravnica Allegiance): $1.99 at Card Kingdom, near mint, their price list as of .
Sphinx of Foresight 
Creature — Sphinx · 4/4 · Rare · Ravnica Allegiance · #55
You may reveal this card from your opening hand. If you do, scry 3 at the beginning of your first upkeep.
Flying
At the beginning of your upkeep, scry 1.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $1.99 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica Allegiance Promos | 55s | Rare | — | $3.99Out of stock |
| Ravnica Allegiance | 55 | Rare | $1.99 | $2.49Out of stock |
2 rulings from Wizards of the Coast
- 25 January 2019If you reveal two Sphinxes of Foresight from your opening hand, you'll scry 3 twice; you won't scry 6. Any cards you put on top of your library the first time you scry 3 will be part of the second time you scry 3.
- 19 March 2021A player's "opening hand" is the hand of cards the player has after all players have taken mulligans. If players have any cards in hand that allow actions to be taken with them from a player's opening hand, the starting player takes all such actions first in any order, followed by each other player in turn order. Then the first turn begins.