Characters with abilities that can ignore one or multiple statistics of opponents or make them irrelevant to a certain extent.
Take note that hax is something relative. For example, atomic destruction, and time stop, are hax abilities for tier 8, but not for tier 2.
Reality/probability/causality warping abilities are not hax for cosmic entities, they are mediocre for beings of this level. Hax is something that should grant a significant advantage over opponents with equal statistics.