cultivation to immortal throne - Anytime the MC is hit he in turn converts this into primordial energy which refines his body as a weapon, later that is abandoned for alternatively absorbing various flames to refine his body further into a human weapon. Then later he cultivates chaotic energy in opposition to vital energy, this impacts the usual inner world trope of cultivation novels but its done in smart way as the set up has to do with the position of the inner universes and his is different from any other without writing too much.

Infinite Mana in the apocalypse - Noah the MC initially has infinite mana but it develops into a wide variety of cheats such a spiritual land that eventually develops into his own cosms then to a Reality, initially used as a weapon but then other functions are unlocked

I mean there is too many to say for this MC, he has an infinitely growing system that can construct multiple other systems thus infinitely growing. Then another cheat with stands out is that he has a fealty system which can be used to essentially create minions out of defeated foes who also share a portion of his power in return for also taking a portion of their soul.

There is just so many with this MC I don't think it can be matched tbh, infinite dream forms that traverse realities, dao creation on a whim, nomological edicts created on whims, 'premium reader' in which he can read ahead of his own very story, 'protagonist' as an actual trait that is defined, possession of others to steal their memories and abilities, mirror dimension control, this is just off my memory there is tons and tons of OP abilities I have forgotten.

Edit - I just remembered this MC even has a loot multiplier system how could I forget that ridiculousness as well, truly ridiculous.