Cast Acererak for {B}.
Brigi triggers, adding {R}.
Acererak enters the battlefield, triggering.
Resolve the Acererak trigger, returning it to your hand and venturing into the Lost Mine of Phandelver.
Each time you trigger the Dark Pool room ability, each opponent loses 1 life and you gain 1 life.
Activate Agent of Stormgald for {R} to add {B}.
Repeat.

Infinite card draw

Infinite draw triggers

Near-infinite +1/+1 counters

Near-infinite colored mana

Near-infinite creature tokens

Near-infinite creature ETB

Near-infinite lifegain

Near-infinite lifegain triggers

Near-infinite lifeloss

Near-infinite creature LTB

Near-infinite storm count

Near-infinite Treasure tokens

Near-infinite ventures into the dungeon

Acererak the Archlich

Birgi, God of Storytelling // Harnfel, Horn of Bounty

Agent of Stromgald

Urza's Incubator

Semblance Anvil

Planar Gate

Centaur Omenreader

Combos with "Agent of Stromgald"