Cheapest priced copy (Ikoria: Lair of Behemoths): $0.35 at Card Kingdom, near mint, their price list as of .
Humble Naturalist 
Creature — Human Druid · 1/3 · Common · Ikoria: Lair of Behemoths · #160
{T}: Add one mana of any color. Spend this mana only to cast a creature spell.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 160 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 17 April 2020Mana produced by Humble Naturalist can be spent on any part of a creature spell’s total cost, including additional costs (such as kicker costs) and alternative costs (such as mutate costs). It can’t be spent to pay the costs of abilities of creatures you control.