After all, you cant play that super-awesome, giant creature if you dont have the mana for it
Cards like Mycosynth Lattice or Trinisphere push Karn from irritating to game-ending, and the fact that this happens without attacking explains why he ranks among good planeswalkers, arguably one of the best to ever get printed for artifact-heavy metas
So, while it might not be a good idea to sell a copy at the moment, it could be good to hang onto one or two for the time being
This flipping condition is not difficult to attain in a deck dedicated to life gain
And realized there might be something even better here: a card that explicitly punishes blinking
And although some early legendary lands either dont meet the power level of today or are so powerful theyre still banned, most legendary lands do reasonably powerful things