Cheapest priced copy (Innistrad: Midnight Hunt): $0.35 at Card Kingdom, near mint, their price list as of .
Heirloom Mirror // Inherited Fiend 
Artifact // Creature — Demon · Uncommon · Innistrad: Double Feature · #105
{1}, {T}, Pay 1 life, Discard a card: Draw a card, mill a card, then put a ritual counter on this artifact. Then if it has three or more ritual counters on it, remove them and transform it. Activate only as a sorcery.
Flying
{2}{B}: Exile target creature card from a graveyard. Put a +1/+1 counter on this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 105 | Uncommon | $0.49 | $0.49 |
| Innistrad: Midnight Hunt | 105 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 24 September 2021Heirloom Mirror will still be tapped after it transforms into Inherited Fiend unless some other effect has untapped it.