At the beginning of combat, Captain Rex Nebula triggers, making Brazen Dwarf a Vehicle and giving it Crew 2 and "Whenever this Vehicle deals damage, roll a six-sided die and sacrifice this Vehicle if the result is equal to its mana value" until end of turn.
Activate Brazen Dwarf's Crew ability by tapping Captain Rex Nebula, making it a creature until end of turn.
Activate Assault Suit's equip ability by paying {3}, attaching it to Brazen Dwarf.
Declare Brazen Dwarf as an attacker and deal combat damage with it.
Brazen Dwarf's ability from Captain Rex Nebula triggers, causing you to roll a six-sided die and fail to sacrifice Brazen Dawrf regardless of the result due to Assault Suit's ability.
Brazen Dwarf triggers from the die roll, dealing 1 damage to each opponent.
Repeat from step 5.

Infinite damage

Infinite die rolls

Captain Rex Nebula

Brazen Dwarf

Assault Suit

Leonin Shikari

Declare a creature you control that cannot be blocked by an opponent as an attacker.
Holding priority, activate Assimilation Aegis' equip ability by paying {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 {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

Declare any creature as an attacker.
Holding priority, activate Dinosaur Headdress' equip ability by paying {2}, 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 an opponent's turn, activate Skullclamp's equip ability by paying {1}, attaching it to another creature with toughness equal to 1.
The creature dies as a state-based action due to having 0 toughness. The Watcher's second ability triggers if the creature was a Tentacle, and Skullclamp triggers.
Resolve the Watcher trigger, if applicable, untapping a Kraken and putting a stun counter on a permanent.
Resolve the Skullclamp trigger, causing you to draw two card.
The Watcher's first ability triggers twice, creating two 1/1 Tentacle creature tokens.
Activate Phyrexian Altar by sacrificing a Tentacle, adding {1}.
Repeat.

Infinite card draw

Near-infinite creature ETB

Infinite draw triggers

Near-infinite creature LTB

Near-infinite death triggers

Near-infinite creature sacrifice triggers

The Watcher in the Water

Skullclamp

Phyrexian Altar

Activate Grafted Wargear's equip ability by paying {0}, targeting Daru Spiritualist.
Daru Spiritualist triggers, causing itself to get +0/+2 until end of turn.
Holding priority, repeat from step 1 an arbitrarily large number of times.
Activate Starlit Sanctum's second ability by paying {W}, tapping it and sacrificing Daru Spiritualist, causing you to gain life equal to Daru Spiritualist's toughness.

Infinite lifegain

Daru Spiritualist

Grafted Wargear

Starlit Sanctum

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 "Leonin Shikari"