Cheapest priced copy (Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Waterknot 
Enchantment — Aura · Common · Core Set 2019 · #311
Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart | 192 | Common | $0.35 | — |
| Core Set 2019 | 311 | Common | $0.35 | — |
| Rivals of Ixalan | 61 | Common | $0.35 | $0.49 |