I say almost, because after a recent unbanning, we need to talk about Worldfire
It will likely be years before another card like these will pass our way again, but never forget: The pendulum swings both ways
More importantly, Phenax gives each of your creatures the ability to mill an opponent a number of cards equal to their toughness
Once the exiled permanent returns, it's considered a new object with no relation to the object that it was
Megaton's Fate has some versatility, but its first mode is basically a Shatter at sorcery speed, and its second mode isn't necessarily going to sweep the board (and those four milled cards aren't doing much either)
Each excess common adds 1 point, and each excess uncommon adds 3 points