Declare Armory Automaton as an attacker.
Armory Automaton triggers, attaching Assimilation Aegis to it.
Assimilation Aegis' second ability triggers, causing Armory Automaton to become a copy of Medomai the Ageless.
Deal combat damage with Armory Automaton.
Armory Automaton triggers, causing you to take an extra turn after this one.
Move to your next turn.
Activate Assimilation Aegis' equip ability by paying {2}, 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

Armory Automaton

Activate Ashnod's Altar by sacrificing Armory Automaton, adding {C}{C}.
Armory Automaton dies, triggering Sword of the Realms, returning Armory Automaton from your graveyard to your hand.
Cast Armory Automaton by paying {2}.
Armory Automaton enters the battlefield, attaching Sword of the Realms to it.
Repeat.

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite storm count

Halvar, God of Battle // Sword of the Realms

Ashnod's Altar

Cloud Key

Declare Armory Automaton as an attacker.
Armory Automaton triggers, causing you to attach Dinosaur Headdress to it, and causing Armory Automaton to become a copy of Medomai the Ageless.
Deal combat damage using Armory Automaton.
Armory Automaton 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

Activate Ashnod's Altar by sacrificing Armory Automaton, adding {C}{C}.
Armory Automaton dies, triggering Sword of the Realms, returning Armory Automaton from your graveyard to your hand.
Cast Armory Automaton by paying {1}.
Armory Automaton enters the battlefield, attaching Sword of the Realms to it.
Repeat.

Infinite colorless mana

Semblance Anvil

Helm of Awakening

Combos with "Armory Automaton"