Cheapest priced copy (New Capenna Commander): $0.69 at Card Kingdom, near mint, their price list as of .
Double Vision 
Enchantment · Rare · New Capenna Commander · #267
Whenever you cast your first instant or sorcery spell each turn, copy that spell. You may choose new targets for the copy.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.69 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Core Set 2021 | 142 | Rare | $0.99 | $1.49 |
| Core Set 2021 | 365 | Rare | $2.79 | $3.49 |
| New Capenna Commander | 267 | Rare | $0.69 | — |
| Core Set 2021 Promos | 142p | Rare | $0.99 | $4.99 |
| Core Set 2021 Promos | 142s | Rare | — | $3.99 |
8 rulings from Wizards of the Coast
- 23 June 2020If the spell that's copied is modal (that is, it says “Choose one —” or the like), the copy will have the same mode or modes. You can't choose different ones.
- 23 June 2020If you cast an instant or sorcery spell before Double Vision enters the battlefield during the same turn, its ability can't trigger that turn.
- 23 June 2020The copy that Double Vision's ability creates is created on the stack, so it's not “cast.” Abilities that trigger when a player casts a spell won't trigger.
- 23 June 2020Double Vision's ability will copy any instant or sorcery spell, not just one with targets.
- 23 June 2020If the spell that's copied has an X whose value was determined as it was cast, the copy has the same value of X.
- 23 June 2020The copy will have the same targets as the spell it's copying unless you choose new ones. You may change any number of the targets, including all of them or none of them. The new targets must be legal.
- 23 June 2020A copy is created even if the spell that caused Double Vision's ability to trigger has been countered by the time that ability resolves. The copy resolves before the original spell.
- 23 June 2020You can't choose to pay any additional costs for the copy. However, effects based on any additional costs that were paid for the original spell are copied as though those same costs were paid for the copy too.