Najeela, The Blade-Blossom cEDH (EDH / Commander)

Nature's Will

1 creature able to deal combat damage to an opponent and 5 lands able to generate WUBRG
Result: Infinite combat steps. Infinite creature tokens.

Requires: All permanents on the battlefield. You control at least one creature that can deal unblocked combat damage to an opponent. You control lands capable of tapping for at least {w}{u}{b}{R}{g}.

Steps:
Attack with your creature.
On combat damage, Nature's Will triggers, tapping all lands the player you damaged controls and untapping your lands.
Activate Najeela for {w}{u}{b}{R}{g}, untapping your attacking creatures, giving them trample, lifelink, and haste, and adding an additional combat phase after this one.
Repeat.

Derevi, Empyrial Tactician

Result: Infinite combat steps. Infinite tokens.

Requires: Najeela, Derevi, and an additional Warrior or two non-Warrior creatures on the battlefield. Up to 5 permanents on the battlefield that in total produce {w}{u}{b}{r}{g}.

Steps:
Attack with Najeela, Derevi, and enough creatures to create 5 Derevi untap triggers.
Once combat damage is dealt, untap enough permanents to produce {w}{u}{b}{r}{g}.
At the end of combat (still in combat but after damage is dealt), activate Najeela for extra combat steps.
Repeat to create more Warrior tokens with each combat step to overrun your opponents.

Demonic Consultation + Thassa's Oracle

Result: Win the game.

Requires: Thassa's oracle in hand. Demonic Consultation in hand. {b} {u} {u} available.

Steps:
Cast Thassa's Oracle and hold priority.
In response to the cast, cast Demonic Consultation, naming a card not in your library to exile your library.
Thassa's Oracle resolves making you look at the top 2.
You win through Oracle's Altarnate win condition since you have no cards in your deck.

Tainted Pact + Thassa's Oracle

Result: Win the game.

Requires: Thassa's oracle in hand. Tainted Pact in hand. Your library can have no two cards with same name.

Steps:
Cast Oracle and hold priority.
In response to the cast, cast Tainted Pact.
Exile your deck.
Oracle resolves making you look at the top 2.
You win through Oracle's Altarnate win condition since you have no cards in your deck.

Ad Nauseam + Teferi's Protection

Result: Infinite card draw.

Requires: All cards in hand. :mana5:{w}{b}{b} available.

Steps:
Cast Ad Nauseam holding priority.
Cast Teferi's Protection.
For each card you put into your hand you lose life equal to its converted mana cost.
You can not lose due to Teferi's Protection.

Najeela, the Blade-Blossom rulings:

2020-11-10: The controller of each Warrior token created by Najeela chooses which player or planeswalker it’s attacking. The tokens don’t have to be attacking the same player or planeswalker as the creature that caused the ability to trigger. They can even be attacking players or planeswalkers that weren’t being attacked.

2020-11-10: Although the tokens created by Najeela’s first ability are attacking, they were never declared as attacking creatures (for the purposes of abilities that trigger whenever a creature attacks, for example).

2020-11-10: Untapping an attacking creature doesn’t remove it from combat.

2020-11-10: There is no main phase before the additional combat phase. This means that, for example, you can’t activate an equip ability between combats.

you'll usually want to activate Najeela after declaring attackers and letting her trigger resolve. This will allow you to untap and grant haste to all the new warriors Najeela produces--thus permitting them to attack again in the subsequent combat phase. You can do this at the end of the declare attackers step, after resolving Najeela's trigger, during the declare blockers phase (after your opponents declare any blocks they may want to make),