Dragoneon, Fabled Legend

Flying, Trample, Haste, Vigilance
All other eeveelutions you control may be
sacrificed to pay for {1} of Dragoneon,
Fabled Legend's casting cost.
"Legends foretold of an Eevee eventually mutating
into the ferocious dragon-type. Sightings were last
reported hundreds of years ago, and most do not
believe it to exist."