That's amazing in going wide brews or stuff with loads of permanents like Voltron or Planeswalkers
For example, if you control Twins of Discord and a colorless creature with bloodthirst 1 enters the battlefield under your control, that creature will enter the battlefield with three +1/+1 counters on it if an opponent has been dealt damage that turn
The fact that this also acts as a mana rock is notable, but not notable enough to get this one to actually see any play
A player who has protection from everything can still have their board wiped with cards like Day of Judgment or Wrath of God, and its one of the best ways to get rid of cards like Progenitus
For now, however, it looks like Mega Evolution isn't going anywhere, and it's possible that some cards in the upcoming set could join the ranks of the most powerful Pokmon TCG cards ever.
An obvious example is something like Colossus Hammer, which is now just a 1-mana +10/+10