Cheapest priced copy (Commander 2019): $4.49 at Card Kingdom, near mint, their price list as of .
Gift of Doom 
Enchantment — Aura · Rare · Commander 2019 · #17
Enchant creature
Enchanted creature has deathtouch and indestructible.
Morph—Sacrifice another creature. (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
As this Aura is turned face up, you may attach it to a creature.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2019 | 17 | Rare | $4.49 | — |
4 rulings from Wizards of the Coast
- 23 August 2019This doesn't target the creature Gift of Doom will enchant, so an opponent's creature with hexproof or a creature with shroud may be chosen this way. The chosen recipient must be able to legally be enchanted by the Aura, so a creature with protection from black can't be chosen this way.
- 23 August 2019If there's no creature you can legally attach Gift of Doom to as you turn it face up, or if you choose not to attach it to a creature, it's put into its owner's graveyard.
- 23 August 2019You can't pay Gift of Doom's morph cost more than once.
- 23 August 2019No player may take any actions between the time you announce that you're turning Gift of Doom face up and the time it's attached to the chosen creature.