Cheapest priced copy (Guilds of Ravnica): $0.35 at Card Kingdom, near mint, their price list as of .
Molderhulk 
Creature — Fungus Zombie · 6/6 · Uncommon · Guilds of Ravnica · #190
Undergrowth — This spell costs {1} less to cast for each creature card in your graveyard.
When this creature enters, return target land card from your graveyard to the battlefield.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Guilds of Ravnica | 190 | Uncommon | $0.35 | $1.99 |
4 rulings from Wizards of the Coast
- 5 October 2018To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as Molderhulk's undergrowth ability). The mana value of the spell remains unchanged, no matter what the total cost to cast it was.
- 5 October 2018Creature cards with other types, such as artifact creature cards, count for undergrowth abilities.
- 5 October 2018If an effect allows you to cast Molderhulk from your graveyard, its undergrowth ability doesn't count itself. It's already on the stack when you determine the total cost to cast it.
- 5 October 2018Because tokens aren't cards, they never count for undergrowth abilities.