You can't pay that amount multiple times to multiply the effect
While Invasion of Regatha has some interesting uses, for the most part, there are other cards that do the same thing but better (Stoke the Flames for the front and Solphim, Mayhem Dominus or Urabrask for the back), which puts the battle in C-tier
Its so good at protecting your threats while also gaining lore
We've already covered Rakdos, the Showstopper in a previous article, so let's turn our attention to the original, far more dangerous incarnation: Rakdos the Defiler
If we want a catch-all removal spell, we would look to play the slow, but effective [card]Utter End[/card]
Long term, it is certainly hurt by banning decks out from under players in a surprise move