Id favor unblockable effects and haste enablers over fight and bite spells, since haste and unblockable enablers are useful even when your win conditions arent around, but bite spells are less effective when youve mostly got tokens (deathtouch notwithstanding)
While we've had dominant decks and cards like Collected Company, Siege Rhino, Pack Rat, and Rally the Ancestors, those formats didn't see huge drops in attendance, and for the most part, by the time the outcry got loud, the problem card was already close to rotation (if you look at Rally and Bant Company, their most dominant times were in the two or three months before they rotated from the format)
Kefkas Tower Bolas's Citadel has a tough mana cost and doesnt do much the turn you play it, but it can offer runaway card advantage
What set is Rasaad, Radiant Monk from