Cheapest priced copy (Ikoria: Lair of Behemoths): $0.35 at Card Kingdom, near mint, their price list as of .
Mystic Subdual 
Enchantment — Aura · Uncommon · Ikoria: Lair of Behemoths · #57
Flash
Enchant creature
Enchanted creature gets -2/-0 and loses all abilities. (Mutating onto the creature won't give it new abilities. It can gain abilities in other ways.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 57 | Uncommon | $0.35 | $0.49 |
| The List | IKO-57 | Uncommon | $0.35 | — |
3 rulings from Wizards of the Coast
- 17 April 2020Mutating the enchanted creature won’t cause it to gain abilities. This is because mutate modifies the creature’s base characteristics, while Mystic Subdual applies to the resulting creature.
- 17 April 2020If a creature has power and toughness written as */* with an ability that defines its power and toughness, its base power and toughness become 0/0 when it loses all abilities. Mystic Subdual then makes it a -2/0. If its power and toughness are written as */*+1, it’s -2/1, and so on.
- 17 April 2020If the affected creature gains an ability after Mystic Subdual becomes attached to it, it will keep that ability.