Cheapest priced copy (Commander 2020): $0.99 at Card Kingdom, near mint, their price list as of .
Majestic Myriarch 
Creature — Chimera · */* · Mythic · Hour of Devastation · #122
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.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.99 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2020 | 182 | Mythic | $0.99 | — |
| Hour of Devastation | 122 | Mythic | $0.99 | $2.49 |
| Hour of Devastation Promos | 122s | Mythic | — | $0.99 |
6 rulings from Wizards of the Coast
- 14 July 2017If a creature gains one of the listed abilities before Majestic Mryiarch's triggered ability resolves, perhaps due to another ability that triggered at the beginning of combat, Majestic Myriarch will gain that ability.
- 14 July 2017Majestic Myriarch's second ability triggers at the beginning of each combat, not just combat on your turn, whether or not any creatures you control have any of the listed abilities.
- 14 July 2017Majestic Myriarch's first ability applies in all zones. While it's on the battlefield, it counts itself, so it'll be at least 2/2.
- 14 July 2017Which abilities Majestic Myriarch gains is determined as the ability resolves. They won't change even if every other creature that has the abilities leaves the battlefield or if creatures enter the battlefield or gain abilities.
- 14 July 2017Multiple instances of any of the abilities Majestic Myriarch can gain are redundant.
- 24 January 2020If one of those creatures has one or more variants of the listed keywords (for example, hexproof from white), this creature gains those specific variants.