Cheapest priced copy (Modern Horizons 3): $0.35 at Card Kingdom, near mint, their price list as of .
Grim Servant 
Creature — Zombie Warlock · 3/2 · Uncommon · Modern Horizons 3 · #409
Menace
When this creature enters, search your library for a card with mana value less than or equal to your devotion to black, reveal it, put it into your hand, then shuffle. You lose 3 life. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 3 | 97 | Uncommon | $0.35 | $0.49 |
| Modern Horizons 3 | 409 | Uncommon | $0.79 | $0.49 |
6 rulings from Wizards of the Coast
- 7 June 2024If a card in a player's library has {X} in its mana cost, X is 0 when determining that card's mana value.
- 7 June 2024Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).
- 7 June 2024If 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. Similarly, if you make an opponent the protector of a Siege you control, mana symbols in that battle's mana cost count toward your devotion.
- 7 June 2024Colorless 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.
- 7 June 2024Count the number of black mana symbols among the mana costs of permanents you control as Grim Servant's triggered ability resolves to determine your devotion to black. If Grim Servant is still on the battlefield at that time, it will be included in that count.
- 7 June 2024Mana symbols in the text boxes of permanents you control don't count toward your devotion to any color.