I'm pretty sure Cultivator Drone's mana can't be spent to pay for Morph or Megamorph costs that don't actually have C in them (which none currently do). However, if a creature with C in its cost (Say, Matter Reshaper) was manifested, could I use Cultivator Drone's mana to pay the cost to turn it face up?
Sure. The cost you need to pay to turn a manifested Matter Reshaper face up is its mana cost, 2C. That's a cost that contains C, so you can use Cultivator Drone's mana on it. The same goes for other creature cards with C in their mana costs.
Interesting followup: Could you use three Cultivator Drones to turn a manifested Matter Reshaper face up? That looks like a yes, because Cultivator Drone's restriction doesn't seem to care what part of the cost is paid.
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Why bother with mere rulings when so many answers can be found in the Rules?
I'm pretty sure Cultivator Drone's mana can't be spent to pay for Morph or Megamorph costs
Wrong.
As Minoke said, you can cast a Morph spell with Drone's mana, because Drone itself says 'spend this mana to cast a colorless spell', which a morphed spell is.
Simply said, mana from Drone can be spent on:
-casting colorless spells, or
-activating abilities of colorless permanents, or
-paying costs that contain C.
I'm pretty sure Cultivator Drone's mana can't be spent to pay for Morph or Megamorph costs
Wrong.
As Minoke said, you can cast a Morph spell with Drone's mana, because Drone itself says 'spend this mana to cast a colorless spell', which a morphed spell is.
Simply said, mana from Drone can be spent on:
-casting colorless spells, or
-activating abilities of colorless permanents, or
-paying costs that contain C.
And a (Mega)Morph cost is not casting a spell or activating an ability, it is the cost to turn a face-down creature with Morph face up, so the OP is correct about that (since they specifically mentioned that there are no creatures with C in their morph costs currently).
I'm pretty sure Cultivator Drone's mana can't be spent to pay for Morph or Megamorph costs
Wrong.
As Minoke said, you can cast a Morph spell with Drone's mana, because Drone itself says 'spend this mana to cast a colorless spell', which a morphed spell is.
Simply said, mana from Drone can be spent on:
-casting colorless spells, or
-activating abilities of colorless permanents, or
-paying costs that contain C.
The question is for the Morph cost, though, not the casting of the spell and that actually is a weird edge case.
If you all you have on the board is three Cultivator Drones along with a manifested Matter Reshaper and a face down Zoetic Cavern you can turn the Matter Reshaper face up but not the Zoetic Cavern. This happens because turning a creature face up isn't an activated ability but Cultivator Drone specifies that any cost with C in it can be paid using Cultivator Drone.
And though you can't use Cultivator to turn a morph up, you CAN use it to cast a Morph from your hand. It is a colorless spell after all.
As Minoke said, you can cast a Morph spell with Drone's mana, because Drone itself says 'spend this mana to cast a colorless spell', which a morphed spell is.
Simply said, mana from Drone can be spent on:
-casting colorless spells, or
-activating abilities of colorless permanents, or
-paying costs that contain C.
RULES OF MAGIC :
http://magic.wizards.com/en/game-info/gameplay/rules-and-formats/rules
And a (Mega)Morph cost is not casting a spell or activating an ability, it is the cost to turn a face-down creature with Morph face up, so the OP is correct about that (since they specifically mentioned that there are no creatures with C in their morph costs currently).
The question is for the Morph cost, though, not the casting of the spell and that actually is a weird edge case.
If you all you have on the board is three Cultivator Drones along with a manifested Matter Reshaper and a face down Zoetic Cavern you can turn the Matter Reshaper face up but not the Zoetic Cavern. This happens because turning a creature face up isn't an activated ability but Cultivator Drone specifies that any cost with C in it can be paid using Cultivator Drone.
RULES OF MAGIC :
http://magic.wizards.com/en/game-info/gameplay/rules-and-formats/rules