Majestic Myriarch is a mythic Creature — Chimera card from Hour of Devastation Promos (PHOU), collector number 122s. Current market price: — (foil $1.79), TCGplayer market prices via Scryfall.
Majestic Myriarch's power and toughness are each equal to twice the number of creatures you control. At the beginning of each combat, this creature gains flying until end of turn if you control a creature with flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.