Oracle

Land 

T: Add C.
1, T: Put a storage counter on Crucible of the Spirit Dragon.
T, Remove X storage counters from Crucible of the Spirit Dragon: Add X mana in any combination of colors. Spend this mana only to cast Dragon spells or activate abilities of Dragons.

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

11/24/2014
You can use mana generated by the last ability to pay an alternative cost (such as a dash cost) or an additional cost to cast a Dragon spell. It’s not limited to paying just that spell’s mana cost.

11/24/2014
An activated ability appears in the form “Cost: Effect.”

11/24/2014
Notably, turning a face-down creature face up isn’t an activated ability. If you manifest a Dragon creature card or cast a Dragon creature card face down using the morph ability, you can’t use mana generated by the last ability to turn that card face up.

11/24/2014
The mana generated by the last ability can’t be spent to activate abilities of Dragon sources that aren’t on the battlefield.

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