Cheapest priced copy (Kamigawa: Neon Dynasty): $0.35 at Card Kingdom, near mint, their price list as of .
Careful Cultivation 
Enchantment — Aura · Common · Kamigawa: Neon Dynasty · #178
Enchant artifact or creature
As long as enchanted permanent is a creature, it gets +1/+3 and has reach and "{T}: Add {G}{G}."
Channel — {1}{G}, Discard this card: Create a 1/1 green Human Monk creature token with "{T}: Add {G}."
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kamigawa: Neon Dynasty | 178 | Common | $0.35 | $0.79 |
| Wilds of Eldraine Commander | 122 | Common | $0.35 | — |
2 rulings from Wizards of the Coast
- 18 February 2022Discarding the card is part of the cost to activate a channel ability.
- 18 February 2022If a channel ability requires a target, you may not activate it without a target just to discard the card.