It does not, for example, change when you may activate abilities that can be activated "only as a sorcery." The last ability cares only about the amount of mana that was actually spent to cast the spell, regardless of its mana cost
Whenever you gain life, put a +1/+1 counter on this creature
Spellbook Price: Cheap to Average One of the most dreaded decks in the history of the game is Spellbook, and its power has only ever been truly eclipsed by the dreaded Dragon Rulers- a shining example of a Tier 0 deck
Powerstone Array is capable of turning a mana profit relatively quickly but that is just in powerstone mana, it takes rather longer if you want just regular mana
Also various reprints have been revealed: Professor's Research (but in Professor Juniper) Air Balloon, Prism Energy, Cheren, Energy Retrieval, Dynamotor Eelektrik