Cheapest priced copy (Modern Horizons): $1.49 at Card Kingdom, near mint, their price list as of .
Aria of Flame 
Enchantment · Rare · Modern Horizons · #118
When this enchantment enters, each opponent gains 10 life.
Whenever you cast an instant or sorcery spell, put a verse counter on this enchantment, then it deals damage equal to the number of verse counters on it to target player or planeswalker.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $1.49 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons | 118 | Rare | $1.49 | $4.49 |
4 rulings from Wizards of the Coast
- 14 June 2019If Aria of Flame leaves the battlefield while its last ability is on the stack, use the number of verse counters it had on it immediately before it left the battlefield to determine how much damage it deals.
- 14 June 2019Aria of Flame’s last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
- 14 June 2019In a Two-Headed Giant game, Aria of Flame’s first ability causes the opposing team to gain 20 life.
- 14 June 2019If the target player or planeswalker is an illegal target by the time Aria of Flame’s last ability tries to resolve, the ability doesn’t resolve. You don’t put a verse counter on Aria of Flame.