Fungal Cavern
Land
T: Add G to your mana pool. Activate this ability only if you control a Swamp.
T: Add B to your mana pool. Activate this ability only if you control a Forest.
Being unable to produce any mana without the proper type nearby kills any hope. It is honestly a significantly worse filter land(Twilight Mire). Even with the ability to tap for colorless it is still a worse filter land. There are occasional points where you would want your land over the filter lands but there are far more situations where you want the filter lands over your lands.
I think it's fine, it's no worse the an ETBT land, and becomes stronger later in the game. I would give it the ability to add 1, then it's more on par with pain lands.
Filterlands are a tad better mana fixing than you often want, but Nimbus Maze was literally in the same cycle as the first filter land and is a perfectly fine design, the template of which you should follow and add a third ability to always tap for colorless. Leaving that off a card should mean it already has a better/equivalent ability or be accompanied by a very thorough reasoning.
Private Mod Note
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Planar Chaos was not a mistake neither was it random. You might want to look at it again.
[thread=239793][Game] Level Up - Creature[/thread]
Land
T: Add G to your mana pool. Activate this ability only if you control a Swamp.
T: Add B to your mana pool. Activate this ability only if you control a Forest.
Behind the eyes of truth, is a world of illustions.
Dragon Riderof a Mist Dragonn anyway with the Dragon Riders Clan.
Finally a good white villain quote: "So, do I ever re-evaluate my life choices? Never, because I know what I'm doing is a righteous cause."
Factions: Sleeping
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Legendary Journey: Heroes & Planeswalkers
Saga: Shards of Rabiah
Legends: The Elder Dragons
Read up on Red Flags & NWO