Activate Phyrexian Altar by sacrificing Reveillark, adding {B}.
When Reveillark dies, it triggers, returning Seedship Broodtender and Boss's Chauffeur from your graveyard to the battlefield. Boss's Chauffeur will enter with a +1/+1 counter on it equal to the number of creatures you control.
When Seedship Broodtender enters, it and Boss's Chauffeur trigger.
Resolve the Boss's Chauffeur trigger, putting a +1/+1 counter on Boss's Chauffeur.
Resolve the Seedship Broodtender trigger, causing you to mill three cards.
Activate Phyrexian Altar by sacrificing Boss's Chauffeur, adding {G}.
When Boss's Chauffeur dies, it triggers, creating a 1/1 Citizen creature token for each +1/+1 counter on it.
Activate Phyrexian Altar three times by sacrificing three Citizens, adding {3}.
Activate Seedship Broodtender by paying {3}{B}{G} and sacrificing it, returning Reveillark from your graveyard to the battlefield.
When Reveillark enters, [[sister]] triggers, causing you to gain 1 life.
Repeat.

Infinite LTB

Infinite ETB

Infinite colored mana

Infinite sacrifice triggers

Infinite death triggers

Infinite self-mill

Infinite creature tokens

Infinite +1/+1 counters on a creature

Seedship Broodtender

Phyrexian Altar

Reveillark

Boss's Chauffeur

Activate Warren Soultrader by paying 1 life and sacrificing Reveillark.
When Reveillark dies, it triggers, returning Seedship Broodtender and Boss's Chauffeur from your graveyard to the battlefield. Boss's Chauffeur will enter with a +1/+1 counter on it equal to the number of creatures you control.
When Seedship Broodtender enters, it, Virulent Emissary and Boss's Chauffeur trigger.
Resolve the Virulent Emissary trigger, causing you to gain 1 life.
Resolve the Boss's Chauffeur trigger, putting a +1/+1 counter on Boss's Chauffeur.
Resolve the Seedship Broodtender trigger, causing you to mill three cards.
Resolve the Warren Soultrader ability, creating a Treasure token.
Activate Warren Soultrader by paying 1 life and sacrificing Boss's Chauffeur.
When Boss's Chauffeur dies, it triggers, creating a 1/1 Citizen creature token for each +1/+1 counter on it.
When the Citizens enter, Virulent Emissary triggers that many times, causing you to gain that much life.
Resolve the Warren Soultrader ability, creating a Treasure token.
Activate Warren Soultrader by paying 1 life and sacrificing a Citizen, creating a Treasure token.
Repeat step 12 two additional times.
Activate five Treasures by tapping and sacrificing them, adding {3}{B}{G}.
Activate Seedship Broodtender by paying {3}{B}{G} and sacrificing it, returning Reveillark from your graveyard to the battlefield.
When Reveillark enters, Virulent Emissary triggers, causing you to gain 1 life.
Repeat.

Infinite lifegain

Infinite lifegain triggers

Warren Soultrader

Virulent Emissary

Activate Warren Soultrader by paying 1 life and sacrificing Reveillark.
When Reveillark dies, it and Vindictive Vampire trigger.
Resolve the Vindictive Vampire trigger, causing you to gain 1 life and dealing 1 damage to each opponent.
Resolve the Reveillark trigger, returning Seedship Broodtender and Boss's Chauffeur from your graveyard to the battlefield. Boss's Chauffeur will enter with a +1/+1 counter on it equal to the number of creatures you control.
When Seedship Broodtender enters, it and Boss's Chauffeur trigger, causing you to mill three cards and put a +1/+1 counter on Boss's Chauffeur.
Resolve the Warren Soultrader ability, creating a Treasure token.
Activate Warren Soultrader by paying 1 life and sacrificing Boss's Chauffeur.
When Boss's Chauffeur dies, it and Vindictive Vampire trigger.
Resolve the Vindictive Vampire trigger, causing you to gain 1 life and dealing 1 damage to each opponent.
Resolve the Boss's Chauffeur trigger, creating a 1/1 Citizen creature token for each +1/+1 counter on it.
Resolve the Warren Soultrader ability, creating a Treasure token.
Activate Warren Soultrader by paying 1 life and sacrificing a Citizen.
When the Citizen dies, Vindictive Vampire triggers, causing you to gain 1 life and dealing 1 damage to each opponent.
Resolve the Warren Soultrader ability, creating a Treasure token.
Repeat from step 12 two additional times.
Activate five Treasures by tapping and sacrificing them, adding {3}{B}{G}.
Activate Seedship Broodtender by paying {3}{B}{G} and sacrificing it.
When Seedship Broodtender dies, Vindictive Vampire triggers, causing you to gain 1 life and dealing 1 damage to each opponent.
Resolve the Seedship Broodtender ability, returning Reveillark from your graveyard to the battlefield.
Repeat.

Infinite damage

Vindictive Vampire

Combos with "Seedship Broodtender"