Cast Spellseeker, stacking Inalla's trigger under Spellseeker's ETB trigger.
Tutor Culling the Weak to hand with Spellseeker's ability.
Cast Culling the Weak, sacrificing Spellseeker and adding {B}{B}{B}{B}.
Resolve and pay for the Inalla trigger from earlier, creating a token copy of Spellseeker and leaving {B}{B}{B} floating.
When the token ETBs, tutor Unearth to your hand.
Unearth Spellseeker, leaving {B}{B} floating.
Shortcut resolving both Inalla's trigger and Spellseeker's ETB, tutoring for Burnt Offering and Finale of Promise, leaving {B} floating.
Cast Burnt Offering, sacrificing Spellseeker and adding {B}{R}{R}.
Use that mana to cast Finale of Promise with X=1 targeting Unearth and Culling the Weak.
Sacrifice a Spellseeker token to Culling the Weak for {B}{B}{B}{B} and Unearth Spellseeker.
Resolve Spellseeker's ETB and Inalla's trigger, tutoring Entomb and Reanimate into hand.
Entomb and then Reanimate Archaeomancer, leaving {B} floating.
Resolve Archaeomancer's ETB, returning Burnt Offering from your graveyard to your hand.
Cast Burnt Offering on Archaeomancer, adding {B}{B}{B}{B}.
Resolve the Inalla trigger from when Archaeomancer ETB'd and return Reanimate to your hand, leaving {B}{B}{B} floating.
Reanimate Archaeomancer and resolve the Inalla trigger, retrieving Burnt Offering and FInale of promise, {B} floating.
Sacrifice Archaeomancer to Burnt Offering, adding {R}{R}{B}{B}.
Cast FInale of Promise with X=1 targeting Entomb and Reanimate.
Entomb Shallow Grave and Reanimate Archaeomancer, {B} floating.
Resolve the Archaeomancer trigger returning Burnt Offering from your graveyard to your hand.
Sacrifice Archaeomancer to Burnt Offering, adding {B}{B}{B}{B}.
Resolve the Inalla trigger, making a token copy of Archaeomancer with haste and leaving {B}{B}{B} floating.
Return Shallow Grave with the token copy's ETB.
Cast Shallow Grave targeting Archaeomancer, leaving {B} floating.
Repeat steps 20-24 for infinite hasty Archaeomancers.

Infinite creature tokens with haste

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Inalla, Archmage Ritualist

Spellseeker

Culling the Weak

Shallow Grave

Burnt Offering

Finale of Promise

Reanimate

Entomb

Archaeomancer

Unearth

Cast Finale of Promise by paying {9}{R}{R}, casting the instant that deals damage or causes lifeloss and Worldfire from your graveyard without paying their mana costs.
Resolve Worldfire, exiling all permanents, all cards in all hands and graveyards, and setting each player's life total to 1.
Resolve the instant that deals damage or causes lifeloss, causing each opponent to lose at least 1 life or be dealt at least 1 damage.
Each opponent loses the game due to having 0 or less life.

Each opponent loses the game

Exile all cards in hands and graveyards

Exile all permanents

Near-infinite lifeloss for all players

Mass Land Denial

Instant That Deals Damage or Causes Lifeloss to Each Opponent

Worldfire

Cast Finale of Promise by paying {10}{R}{R}, causing you to cast Cackling Counterpart from your graveyard without paying its mana cost and copying it twice, with all spells targeting Biovisionary.
Resolve all Cackling Counterparts, creating three token copies of Biovisionary.
At the beginning of your end step, each Biovisionary you control triggers.
Resolve the first trigger, causing you to win the game.

Win the game

Biovisionary

Cackling Counterpart

Cast Finale of Promise by paying {10}{R}{R}, causing you to cast Clone Legion from your graveyard without paying its mana cost and copying it twice, with all spells targeting you.
Resolve all Clone Legions, creating three token copies of Biovisionary and every other creature you control.
At the beginning of your end step, each Biovisionary you control triggers.
Resolve the first trigger, causing you to win the game.

Clone Legion

Cast Finale of Promise by paying {10}{R}{R}, causing you to cast Croaking Counterpart from your graveyard without paying its mana cost and copying it twice, with all spells targeting Biovisionary.
Resolve all Croaking Counterparts, creating three token copies of Biovisionary that are 1/1 Frogs.
At the beginning of your end step, each Biovisionary you control triggers.
Resolve the first trigger, causing you to win the game.

Croaking Counterpart

Cast Finale of Promise by paying {10}{R}{R}, causing you to cast Quasiduplicate from your graveyard without paying its mana cost and copying it twice, with all spells targeting Biovisionary.
Resolve all Quasiduplicates, creating three token copies of Biovisionary.
At the beginning of your end step, each Biovisionary you control triggers.
Resolve the first trigger, causing you to win the game.

Quasiduplicate

Cast Finale of Promise by paying {10}{R}{R}, causing you to cast Twinflame from your graveyard without paying its mana cost and copying it twice, with all spells targeting Biovisionary.
Resolve all Twinflames, creating three token copies of Biovisionary.
At the beginning of your end step, each Biovisionary you control triggers, and Twinflame triggers three times.
Resolve the first Biovisionary trigger, causing you to win the game.

Twinflame

Cast Finale of Promise by paying {10}{R}{R}, causing you to cast Sublime Epiphany from your graveyard without paying its mana cost and copying it twice, with all spells targeting Biovisionary.
Resolve all Sublime Epiphanies, creating three token copies of Biovisionary.
At the beginning of your end step, each Biovisionary you control triggers.
Resolve the first trigger, causing you to win the game.

Combos with "Finale of Promise"