Cheapest priced copy (Modern Horizons 2): $0.35 at Card Kingdom, near mint, their price list as of .
Underworld Hermit 
Creature — Human Peasant · 3/3 · Uncommon · Modern Horizons 2 · #105
When this creature enters, create a number of 1/1 green Squirrel creature tokens equal to your devotion to black. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 2 | 105 | Uncommon | $0.35 | $0.49 |
| Modern Horizons 2 | 347 | Uncommon | $0.35 | $0.49 |
| The List | MH2-105 | Uncommon | $0.35 | — |
5 rulings from Wizards of the Coast
- 18 June 2021Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).
- 18 June 2021If you put an Aura on an opponent's permanent, you still control the Aura, and mana symbols in its mana cost count towards your devotion.
- 18 June 2021Mana symbols in the text boxes of permanents you control don't count toward your devotion to any color.
- 18 June 2021If an activated ability or triggered ability has an effect that depends on your devotion to a color, you count the number of mana symbols of that color among the mana costs of permanents you control as the ability resolves. The permanent with that ability will be counted if it's still on the battlefield at that time.
- 18 June 2021Colorless and generic mana symbols ({C}, {0}, {1}, {2}, {X}, and so on) in mana costs of permanents you control don't count toward your devotion to any color.