Cheapest priced copy (Strixhaven: School of Mages): $0.69 at Card Kingdom, near mint, their price list as of .
Show of Confidence 
Instant · Uncommon · Strixhaven: School of Mages · #28
When you cast this spell, copy it for each other instant and sorcery spell you've cast this turn. You may choose new targets for the copies.
Put a +1/+1 counter on target creature. It gains vigilance until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.49 to $0.69 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Strixhaven: School of Mages | 28 | Uncommon | $0.69 | $0.49 |
3 rulings from Wizards of the Coast
- 16 April 2021Magecraft abilities trigger once for each copy created as Show of Confidence’s triggered ability resolves.
- 16 April 2021The triggered ability counts all instants and sorceries that were cast before it resolves. If you cast instant spells in response to the ability, those spells will count.
- 16 April 2021If the target of the original Show of Confidence has become an illegal target when that spell is copied, the copies will initially still target the same creature. If you don’t choose new targets for the copies, they each will fail to resolve. Notably, you don’t have to change targets, especially not to opposing creatures, just because the current target of Show of Confidence is illegal.