Cheapest priced copy (Streets of New Capenna Promos): $0.49 at Card Kingdom, near mint, their price list as of .
Unleash the Inferno 
Instant · Rare · Streets of New Capenna · #229
Unleash the Inferno deals 7 damage to target creature or planeswalker. When it deals excess damage this way, destroy target artifact or enchantment an opponent controls with mana value less than or equal to that amount of excess damage.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.49 to $0.69 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Streets of New Capenna Promos | 229p | Rare | $0.49 | $0.49 |
| Streets of New Capenna Promos | 229s | Rare | — | $0.49 |
| Streets of New Capenna | 229 | Rare | $0.49 | $0.49 |
| Streets of New Capenna | 337 | Rare | $0.49 | $0.49 |
| Streets of New Capenna | 402 | Rare | — | $0.69 |
3 rulings from Wizards of the Coast
- 29 April 2022A permanent cannot be dealt 0 excess damage.
- 29 April 2022Excess damage has been dealt to a planeswalker if the amount of damage dealt to it is greater than the number of loyalty counters that it had remaining when the damage was dealt.
- 29 April 2022Excess damage has been dealt to a creature if the damage dealt to it is greater than lethal damage. Usually, this means damage greater than its toughness, although damage already marked on the creature is taken into account.