Cheapest priced copy (Strixhaven: School of Mages): $0.35 at Card Kingdom, near mint, their price list as of .
Leyline Invocation 
Sorcery · Common · Strixhaven: School of Mages · #136
Create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is the number of lands you control.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Strixhaven: School of Mages | 136 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 16 April 2021The number of lands you control is counted as Leyline Invocation resolves.