Cheapest priced copy (Hour of Devastation): $0.49 at Card Kingdom, near mint, their price list as of .
Imminent Doom 
Enchantment · Rare · Hour of Devastation · #98
This enchantment enters with a doom counter on it.
Whenever you cast a spell with mana value equal to the number of doom counters on this enchantment, this enchantment deals that much damage to any target. Then put a doom counter on this enchantment.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $0.69 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Hour of Devastation | 98 | Rare | $0.49 | $0.49 |
| Hour of Devastation Promos | 98s | Rare | — | $0.69 |
3 rulings from Wizards of the Coast
- 14 July 2017If a spell has {X} in its mana cost, include the value chosen for that X when determining the mana value of that spell.
- 14 July 2017The amount of damage Imminent Doom's triggered ability deals is the number of counters it had on it as the ability triggered. For example, if you cast Shock and then respond to Imminent Doom's triggered ability with a second Shock, both abilities cause Imminent Doom to deal 1 damage and Imminent Doom will end up with three doom counters on it.
- 14 July 2017Imminent Doom's triggered ability resolves before the spell that caused it to trigger. The ability will resolve even if that spell is countered.