User blog comment:GrimRevenger/Mayu's Room Guess/@comment-11256698-20160612033447/@comment-25114063-20160613004623

Heike engine is used in so many decks, and it's been used even before Big Bang was nerfed. If TakaraTomy wanted to nerf it, they would have nerfed it earlier.

As for the rest of your concerns, those are cheese decks. TakaraTomy already made Idol Defense to counter that.