At the beginning of your combat phase, Captain Rex Nebula triggers, causing Aetherflux Reservoir to become a Vehicle artifact with crew 2.
Activate Aetherflux Reservoir's crew ability by tapping Captain Rex Nebula, causing Aetherflux Reservoir to become an artifact creature until end of turn.
Give Aetherflux Reservoir lifelink.
Activate Aetherflux Reservoir by paying 50 life, dealing 50 damage to any target and causing you to gain 50 life.
Aetherflux Reservoir triggers.
Holding priority, repeat from step 4.

Infinite lifegain triggers

Infinite damage

Infinite dice roll

Captain Rex Nebula

Aetherflux Reservoir

Basilisk Collar

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 die rolls

Brazen Dwarf

Assault Suit

Leonin Shikari

At the beginning of combat, Captain Rex Nebula triggers, making Devoted Druid a Vehicle until end of turn.
Activate Devoted Druid's first activated ability by tapping it, adding {G}.
Activate Devoted Druid's second activated ability by putting a -1/-1 counter on it, untapping it.
Repeat from step 2.

Infinite green mana

Devoted Druid

Cast Exchange of Words by paying {1}{U}{U}.
Exchange of Words enters the battlefield, exchanging the text boxes of Brazen Dwarf and the creature with mana value 0 or mana value greater than 6.
At the beginning of combat, Captain Rex Nebula triggers, making the creature that now has Brazen Dwarf's text box 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 the Vehicle's crew ability by tapping Captain Rex Nebula, making it a creature until end of turn.
Declare the Vehicle as an attacker and deal combat damage with it.
The Vehicle's ability from Captain Rex Nebula triggers, rolling a six-sided die with no chance of a result equal to the Vehicle's mana value.
The Vehicle's ability from Brazen Dwarf triggers, dealing 1 damage to each opponent.
Repeat from step 6.

Exchange of Words

At the beginning of your combat phase, Captain Rex Nebula triggers, causing Aetherflux Reservoir to become a Vehicle artifact with crew 2.
Activate Aetherflux Reservoir's crew ability by tapping Captain Rex Nebula, causing Aetherflux Reservoir to become an artifact creature until end of turn.
Cast Vampiric Link by paying {B}, targeting Aetherflux Reservoir.
Aetherflux Reservoir triggers, causing you to gain 1 life for each spell you've cast this turn.
Resolve Vampiric Link, attaching it to Aetherflux Reservoir.
Activate Aetherflux Reservoir by paying fifty life, dealing fifty damage to any target.
Aetherflux Reservoir and Vampiric Link trigger.
Resolve the Vampiric Link trigger, causing you to gain fifty life.
Repeat from step 6.

Infinite lifegain

Vampiric Link

Animate All Will Be One with Captain Rex Nebula.
Give All Will Be One lifelink.
Gain life in any way.
Archangel of Thune triggers, putting a +1/+1 counter on each creature you control.
All Will Be One triggers, dealing 1 damage to an opponent and causing you to gain at least 1 life.
Repeat from step 4.

Infinite +1/+1 counters

All Will Be One

Archangel of Thune

At the beginning of combat, Captain Rex Nebula triggers, making the Archipelagore mutated creature 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 this Vehicle's Crew ability by tapping Captain Rex Nebula, making it a creature until end of turn.
Declare the Vehicle as an attacker and deal combat damage with it.
The Vehicle's ability from Captain Rex Nebula triggers, rolling a six-sided die with no chance of a result equal to the Vehicle's mana value of 7.
The Vehicle's ability from Brazen Dwarf triggers, dealing 1 damage to each opponent.
Repeat from step 4.

Combos with "Captain Rex Nebula"