If you were to control a card like Platinum Angel, then they cant win because the Angel specifically says so
Primal Rage gives another form of evasion to your creatures because most of them are 3/3s or 5/5s
If we were to rank these Megas based on the modern Expanded Format, M Charizard-EX (X) from Flashfire would be on the list due to its heavy use in Regidrago V-Star decks, but in the XY Format, it was rarely even seen due to how slow it was to set up
If it shows up in a tasty list somewhere or a new combo piece gets printed we can certainly reevaluate
That said, its still pretty decent, especially for Rakdos
The second attack, Fire Spin, deals quite a bit of damage for a basic Pokmon by inflicting 220 damage (though the player must discard 2 energies every time they use this attack)