Out of curiosity I wanted to see how hard I could push Niv-Mizzet Reborn if I were to build it my way. Let's see how it goes!

Counterspells
Boardwipes
Ramp
Busted Draw/spells/commands/charms
Max hand and recycle library
Gods- Ojer Axonill and Purphuoros with a world tree activation and 8 other gods (10 total in deck) is Instant speed 40 damage to each opponent if they are all in the deck. If we include Heliod, Sun crowned and 1W on top of the activation cost, giving Axonill lifelink with all the triggers on the stack, he will scale with each activation. This brings him to 39 with 6 gods, and 79 with 10. If Rhonas the indomitable is in the mix, then for 2G we can pump him manually to moderate higher. This gives a pretty flexible win con that's fairly deterministic. If they survive we untap with a lot of gods. The deck is light on space, so having more concise win cons are fine, but I like something fairly difficult to intuit and deterministic in a try harder build. If we mke them things we can't hit with Niv and make recurring niv the best way to restock, then it's likely they are still in the deck when we need them. Having ways to shuffle them back in is useful.

Then again just casting an omniscience will bo it with recyclers in the deck. Fuck, we can Ionize them to death at that point if they want. No win cons, just dull spoons if they have the patience to die that way. But the stranglehold will be so deep, there's no hope of escape. Just ensure that the graveyard, deck, and hand are just interchageable as needed and voila, my deck versus everything. at all times, in all ways.