Cheapest priced copy (March of the Machine): $0.79 at Card Kingdom, near mint, their price list as of .
Ayara, Widow of the Realm // Ayara, Furnace Queen 
Legendary Creature — Elf Noble // Legendary Creature — Phyrexian Elf Noble · 3/3 · Rare · March of the Machine · #296
{T}, Sacrifice another creature or artifact: Ayara deals X damage to target opponent or battle and you gain X life, where X is the sacrificed permanent's mana value.
{5}{R/P}: Transform Ayara. Activate only as a sorcery. ({R/P} can be paid with either {R} or 2 life.)
At the beginning of combat on your turn, return up to one target artifact or creature card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.79 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine | 90 | Rare | $0.99 | $0.99 |
| March of the Machine | 296 | Rare | $0.79 | $0.99 |
| March of the Machine Promos | 90s | Rare | — | $3.99 |
One ruling from Wizards of the Coast
- 14 April 2023The first activated ability of Ayara, Widow of the Realm uses the mana value of the permanent you sacrificed as it last existed on the battlefield, not its mana value in the graveyard.