Cheapest priced copy (Commander 2021): $0.79 at Card Kingdom, near mint, their price list as of .
Radiant Performer 
Creature — Human Wizard · 2/2 · Rare · Commander 2021 · #54
Flash
When this creature enters, if you cast it from your hand, choose target spell or ability that targets only a single permanent or player. Copy that spell or ability for each other permanent or player the spell or ability could target. Each copy targets a different one of those permanents and players.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.79 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2021 | 54 | Rare | $0.79 | — |
| Commander 2021 | 381 | Rare | $2.49 | — |
4 rulings from Wizards of the Coast
- 16 April 2021You copy the spell or ability for every permanent or player it could target. That is, you don't choose either permanents or players and then make copies based on that.
- 16 April 2021You control all the copies, and you'll choose which copy targets which permanent or player. For example, if the original spell says, "Destroy target creature," you'll ultimately choose the order in which each creature targeted by a copy is destroyed. Remember that the original spell or ability will resolve after all of the copies.
- 16 April 2021Each copy you create will cause your magecraft abilities to trigger.
- 16 April 2021You can choose a spell or ability with multiple targets as long as all of those targets are the same permanent or player.