CardName: Horn of Valere
Cost: (7)
Type: Legendary Artifact
Pow/Tgh: /
Rules Text: {4}{t}. Sacrifice Horn of Valere: Return all Legendary
Creature cards from your graveyard to the battlefield under
your control. These creatures gain Haste. At the beginning
of the next end step, sacrifice them.
Flavour Text:
Set/Rarity: Wheel of Time Mythic
Horn of Valere
()
M
Legendary Artifact
. Sacrifice Horn of Valere: Return all Legendary Creature cards from your graveyard to the battlefield under your control. These creatures gain Haste. At the beginning of the next end step, sacrifice them.
That's a very suitable representation of the Horn.