At the beginning of each upkeep, Tombostone Stairwell's first ability triggers, causing each player to create a 2/2 Zombie creature token for each creature card in their graveyard.
At the beginning of each end step, Tombstone Stairwell's second ability triggers, destroying all tokens created by it.
When the token(s) die, Blood Artist triggers that many times, causing an opponent to lose that much life and you to gain that much life.
Repeat during each turn.

Near-infinite lifeloss

Near-infinite creature ETB

Near-infinite creature LTB

Near-infinite death triggers

Near-infinite lifegain

Near-infinite lifegain triggers

Tombstone Stairwell

Blood Artist

Gain any amount of life.
Trudge Garden triggers, causing you to pay {2} to create a 4/4 Fungus Beast creature token.
Activate Ashnod's Altar by sacrificing the Fungus Beast, adding {C}{C}.
When the Fungus Beast dies, Blood Artist triggers, causing you to gain 1 life and target opponent to lose 1 life.
Repeat from step 2.

Infinite creature ETB

Infinite lifegain

Infinite lifegain triggers

Infinite lifeloss

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite death triggers

Trudge Garden

Ashnod's Altar

Activate Spawnsire of Ulamog's first abiltiy by paying {4}, create two 0/1 Eldrazi Spawn creature tokens.
Activate Ashnod's Altar twice by sacrificing two Eldrazi Spawn tokens, adding {C}{C}{C}{C}.
Repeat.

Spawnsire of Ulamog

Activate Ashnod's Altar by sacrificing the nontoken Samurai or changeling, adding {C}{C}.
When the creature dies, Oathkeeper triggers, returning the creature from your graveyard to the battlefield.
Activate Oathkeeper's equip ability by paying {2}, attaching it to the creature.
Repeat.

Oathkeeper, Takeno's Daisho

Activate Ashnod's Altar by sacrificing Gravecrawler, adding {C}{C}.
Activate Prismite by paying {2}, adding {B}.
Cast Gravecrawler from your graveyard by paying {B}.
Repeat.

Infinite storm count

Gravecrawler

Prismite

Cast Prossh, creating 6 kobold tokens.Sacrifice6 tokens to Altar to produce {12}.
Use {6} to produce {B}{R}{G} with Scarecrow.SacrificeProssh to Altar to put him back into the command zone.
(also producing {2})
Floating {8}{B}{R}{G}, recast Prossh for {5}{B}{R}{G}, producing 8 tokens.Sacrifice them all to Altar producing {20}, filter again, and repeat.

Infinite magecraft triggers

Infinitely powerful creature until end of turn

Infinite colored mana

Infinite creature tokens

Infinite colorless mana

Prossh, Skyraider of Kher

Signpost Scarecrow

Activate Sliver Queen by paying {2}, creating a 1/1 Sliver token.
Activate Ashnod's Altar by sacrificing the Sliver token, adding {C}{C}.
Repeat.

Sliver Queen

Activate Ashnod's Altar by sacrificing the creature, adding {C}{C}.
When the creature dies, Enduring Renewal triggers, returning the creature from your graveyard to your hand.
Cast the creature by paying its mana cost.
Repeat.
If the creature can be cast using {C} or less, this combo nets infinite colorless mana.

Enduring Renewal

Activate Twilight Drover by paying {2}{W} and removing a +1/+1 counter from it, creating two 1/1 Spirit creature tokens.
Activate Ashnod's Altar twice by sacrificing the Spirit tokens, adding {C}{C}{C}{C}.
When the Spirits die, Twilight Drover triggers twice, putting two +1/+1 counters on Twilight Drover.
Activate Prismite by paying {2}, adding {W}.
Repeat.

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