Cheapest priced copy (Edge of Eternities): $0.35 at Card Kingdom, near mint, their price list as of .
Fungal Colossus 
Creature — Fungus Beast · 5/5 · Common · Edge of Eternities · #184
This spell costs {X} less to cast, where X is the number of differently named lands you control.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Edge of Eternities | 184 | Common | $0.35 | $0.49 |
4 rulings from Wizards of the Coast
- 25 July 2025Fungal Colossus’s mana value doesn’t change no matter what the number of differently named lands you control is.
- 25 July 2025Once you announce you’re casting a spell, no player may take actions until after the spell has been paid for. Notably, opponents can’t try to remove lands you control from the battlefield at that time.
- 25 July 2025Once you determine the cost to cast Fungal Colossus, you may activate mana abilities to pay that cost. If the number of differently named lands you control changes while activating mana abilities (probably because you sacrificed one or more lands), the cost to cast Fungal Colossus remains what you previously determined.
- 25 July 2025To determine the number of differently named lands you control, count each land you control once, but only if its English name isn’t exactly the same as another land you’ve already counted this way.