Cast Mardu Siegebreaker by paying its mana cost.
When Mardu Siegebreaker enters, it and Radiant Solar trigger.
Resolve the Mardu Siegebreaker trigger, exiling Stirring Bard until Mardu Siegebreaker leaves the battlefield.
Resolve the Radiant Solar trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice Mardu Siegebreaker.
Mardu Siegebreaker leaves the battlefield, causing Stirring Bard to be returned to the battlefield from exile.
When Stirring Bard enters, it and Radiant Solar trigger.
Resolve the Stirring Bard trigger, venturing into the Cradle of the Death God room, creating a 4/4 legendary The Atropal creature token and completing Tomb of Annihilation.
If you control two or more The Atropal tokens, put all but one into your graveyard due to the legend rule.
Sefris' second ability triggers, returning Mardu Siegebreaker from your graveyard to the battlefield.
When Mardu Siegebreaker enters, it and Radiant Solar trigger.
Resolve the Mardu Siegebreaker trigger, exiling Stirring Bard until Mardu Siegebreaker leaves the battlefield.
Resolve the Radiant Solar trigger from step 10, venturing into Tomb of Annihilation and into the Trapped Entry room, causing each player to lose 1 life.
Resolve the Radiant Solar trigger from step 6, venturing into the Oubliette room, causing you to discard a card and then sacrifice Mardu Siegebreaker.
Repeat from step 5.

Near-infinite creature ETB

Near-infinite creature LTB

Near-infinite death triggers

Near-infinite lifeloss for all players

Near-infinite creature sacrifice triggers

Radiant Solar

Sefris of the Hidden Ways

Stirring Bard

Mardu Siegebreaker

Cast Wormfang Drake by paying its mana cost.
When Wormfang Drake enters, it and Radiant Solar trigger.
Resolve the Wormfang Drake trigger, exiling Stirring Bard.
Resolve the Radiant Solar trigger, venturing into the Oubliette room, causing you to discard a card and then sacrifice Wormfang Drake.
When Wormfang Drake dies, it triggers, returning Stirring Bard from exile to the battlefield.
When Stirring Bard enters, it and Radiant Solar trigger.
Resolve the Stirring Bard trigger, venturing into the Cradle of the Death God room, creating a 4/4 legendary The Atropal creature token and completing Tomb of Annihilation.
If you control two or more The Atropal tokens, put all but one into your graveyard due to the legend rule.
Sefris' second ability triggers, returning Wormfang Drake from your graveyard to the battlefield.
When Wormfang Drake enters, it and Radiant Solar trigger.
Resolve the Wormfang Drake trigger, exiling Stirring Bard.
Resolve the Radiant Solar trigger from step 10, venturing into Tomb of Annihilation and into the Trapped Entry room, causing each player to lose 1 life.
Resolve the Radiant Solar trigger from step 6, venturing into the Oubliette room, causing you to discard a card and then sacrifice Wormfang Drake.
Repeat from step 5.

Wormfang Drake

Complete a dungeon.
Sefris' second ability triggers twice due to Delney.
Resolve the first trigger, returning up to one other creature from your graveyard to the battlefield.
Resolve the second trigger, returning Stirring Bard from your graveyard onto the battlefield.
When Stirring Bard enters, it and Preston trigger twice due to Delney.
Holding priority, activate Shilgengar by sacrificing Stirring Bard.
Resolve a Preston trigger, creating a token copy of Stirring Bard that is a 0/1 Illusion.
When the Stirring Bard token enters, it triggers twice due to Delney.
Resolve the Stirring Bard token triggers, venturing into Undercity twice.
Resolve the second Preston trigger from step 5, creating a token copy of Stirring Bard that is a 0/1 Illusion.
Repeat steps 8 and 9 one additional time.
Resolve the first Stirring Bard trigger from step 5, venturing into Undercity and completing Undercity.
Repeat from step 2.

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Infinite artifact tokens

Infinite +1/+1 counters on creatures you control

Infinite Blood tokens

Infinite creature ETB

Infinite creature LTB

Infinite Treasure tokens

Infinite card draw

Infinite colored mana

Infinite creature tokens

Infinite death triggers

Infinite draw triggers

Infinite rummaging

Infinite creature sacrifice triggers

Infinite self-discard triggers

Near-infinite lifeloss

Put all basic lands from your library into your hand

Put all creature cards from your library onto the battlefield

Return most creature cards from your graveyard onto the battlefield

Preston, the Vanisher

Delney, Streetwise Lookout

Shilgengar, Sire of Famine

Combos with "Stirring Bard"