Skittish Valesk is a uncommon Creature — Beast card from Onslaught (ONS), collector number 231. Current market price: $0.21 (foil $0.57), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, flip a coin. If you lose the flip, turn this creature face down. Morph {5}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)