Prossh, Skyraider of Kher is a mythic Legendary Creature — Dragon card from Masters 25 (A25), collector number 214. Current market price: $0.38 (foil $5.50), TCGplayer market prices via Scryfall.
When you cast this spell, create X 0/1 red Kobold creature tokens named Kobolds of Kher Keep, where X is the amount of mana spent to cast it. Flying Sacrifice another creature: Prossh gets +1/+0 until end of turn.