Cheapest priced copy (Strixhaven: School of Mages Promos): $0.49 at Card Kingdom, near mint, their price list as of .
Silverquill Command 
Sorcery · Rare · Strixhaven: School of Mages · #352
Choose two —
• Target creature gets +3/+3 and gains flying until end of turn.
• Return target creature card with mana value 2 or less from your graveyard to the battlefield.
• Target player draws a card and loses 1 life.
• Target opponent sacrifices a creature of their choice.
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 | 232p | Rare | $0.49 | $0.79 |
| Strixhaven: School of Mages Promos | 232s | Rare | — | $0.99 |
| Strixhaven: School of Mages | 232 | Rare | $0.49 | $0.79 |
| Strixhaven: School of Mages | 352 | Rare | $0.79 | $0.49 |
2 rulings from Wizards of the Coast
- 16 April 2021If at least one target is still legal as Silverquill Command tries to resolve, it will resolve and do as much as it can.
- 16 April 2021If all of Silverquill Command’s targets are illegal as it tries to resolve, it will do nothing.