Cheapest priced copy (Strixhaven: School of Mages Promos): $0.49 at Card Kingdom, near mint, their price list as of .
Manifestation Sage 
Creature — Human Wizard · 2/2 · Rare · Strixhaven: School of Mages · #347
When this creature enters, create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is the number of cards in your hand.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Strixhaven: School of Mages Promos | 205p | Rare | $0.49 | $0.79 |
| Strixhaven: School of Mages Promos | 205s | Rare | — | $0.99 |
| Strixhaven: School of Mages | 205 | Rare | $0.49 | $0.49 |
| Strixhaven: School of Mages | 347 | Rare | $0.49 | $0.49 |
One ruling from Wizards of the Coast
- 16 April 2021X is number of cards in your hand as Manifestation Sage’s triggered ability resolves.