Cheapest priced copy (March of the Machine Commander): $1.49 at Card Kingdom, near mint, their price list as of .
Semester's End 
Instant · Rare · Strixhaven: School of Mages · #27
Exile any number of target creatures and/or planeswalkers you control. At the beginning of the next end step, return each of them to the battlefield under its owner's control. Each of them enters with an additional +1/+1 counter on it if it's a creature and an additional loyalty counter on it if it's a planeswalker.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $1.49 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 834 | Rare | $2.29 | — |
| March of the Machine Commander | 204 | Rare | $1.49 | — |
| Strixhaven: School of Mages Promos | 27p | Rare | $5.49 | $7.99 |
| Strixhaven: School of Mages Promos | 27s | Rare | — | $3.99Out of stock |
| Strixhaven: School of Mages | 27 | Rare | $1.49 | $1.99 |
| Strixhaven: School of Mages | 292 | Rare | $3.99 | $3.99 |
One ruling from Wizards of the Coast
- 16 April 2021Use the characteristics of each permanent as it returns to the battlefield to determine if it should enter with an additional +1/+1 counter, an additional loyalty counter, or in very unusual cases, both. Notably, if you exile a creature that was only a creature because of a type-changing effect, it will enter as a noncreature permanent and won't get any additional +1/+1 counters from the effect of Semester's End.