Declare a creature you control that cannot be blocked by an opponent as an attacker.
Holding priority, activate Assimilation Aegis' equip ability by paying either {0} or {2}, attaching it to the creature.
Assimilation Aegis' second ability triggers, causing the creature to become a copy of Medomai the Ageless.
Deal combat damage with the creature.
The creature triggers, causing you to take an extra turn after this one.
Move to your next turn.
Activate Assimilation Aegis' equip ability by paying {0}, attaching it to any other creature.
Assimilation Aegis' second ability triggers, causing the creature to become a copy of Medomai the Ageless.
Repeat.

Infinite turns

Lock

Medomai the Ageless

Assimilation Aegis

Forge Anew

Declare any creature as an attacker.
Holding priority, activate Dinosaur Headdress' equip ability by paying {0} if it's the first equip ability you've activated this turn, or {2} otherwise, attaching it to the attacking creature, and causing the creature to become a copy of Medomai the Ageless.
Deal combat damage using the creature.
The creature triggers, causing you to take an extra turn after this one.
Move to your postcombat main phase.
Activate Dinosaur Headdress' equip ability by paying {2}, attaching it to any other creature you control.
Repeat each turn.

Paleontologist's Pick-Axe // Dinosaur Headdress

During the end step prior to your turn, activate Grinning Totem by paying {2} and tapping it, causing you to search an opponent's library for an instant or sorcery card that can target a creature and exile it with the ability to cast it until your next upkeep.
At the beginning of your upkeep, Grinning Totem triggers, attempting to put the instant or sorcery into its owners graveyard, but instead exiling it with a void counter due to Dauthi Voidwalker.
Activate Dauthi Voidwalker by tapping and sacrificing it, causing you to cast the instant or sorcery without paying its mana cost, targeting Tethmos High Priest.
Tethmos High Priest triggers, returning Dauthi Voidwalker from your graveyard to the battlefield.
Holding priority, activate Lightning Greaves' equip ability by paying {0}, attaching it to Tethmos High Priest.
Resolve the instant or sorcery spell, causing it to do nothing as Tethmos High Priest is now an illegal target, and then exile it with a void counter on it due to Dauthi Voidwalker.
Activate Lightning Greaves' equip ability by paying {0}, attaching it to Dauthi Voidwalker.
Repeat from step 3.

Combos with "Forge Anew"