Cheapest priced copy (Ravnica: Clue Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Law-Rune Enforcer 
Creature — Human Soldier · 1/2 · Common · War of the Spark · #20
{1}, {T}: Tap target creature with mana value 2 or greater.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica: Clue Edition | 64 | Common | $0.35 | — |
| Jumpstart 2022 | 206 | Common | $0.35 | — |
| War of the Spark | 20 | Common | $0.35 | $0.79 |
2 rulings from Wizards of the Coast
- 3 May 2019Tokens that aren't a copy of something else don't have a mana cost. Anything without a mana cost normally has a mana value of 0.
- 3 May 2019If a permanent has {X} in its mana cost, X is considered to be 0.