Phantasmal Mount is a uncommon Creature — Illusion Horse card from Ice Age (ICE), collector number 88. Current market price: $0.29, TCGplayer market prices via Scryfall.
Flying {T}: Target creature you control with toughness 2 or less gets +1/+1 and gains flying until end of turn. When this creature leaves the battlefield this turn, sacrifice that creature. When the creature leaves the battlefield this turn, sacrifice this creature.