This is true even if you pay an additional cost while casting a spell "without paying its mana cost." If the legendary spell you cast this way is copied, the copy can be countered
However, with Rhystic Study on your side, you should have no trouble drawing into an answer for whatever new threats are sent your way
Ramping half the table to remove one utility land is a horrific rate
Innistrad: Remastered brings it to the fore once again, with a new Collector-booster only Headliner card, in this case, a serialized movie poster Edgar Markov
In comes Aurelia, the Law Above, rewarding you for your attacks, and your opponents' retaliations
But this land is a bit more versatile than a dual land that just enters tapped