Cast Abby from the command zone by paying {1}{R}{G} plus commander tax.
Abby triggers, creating a number of 1/1 Cordyceps Infected creature tokens.
When the Cordyceps Infected tokens enter, Mana Echoes triggers that many times, adding {C} for each Fungus and/or Zombie you control for each trigger.
Resolve Abby, giving control of it to an opponent.
Activate Goblin Bombardment four times by sacrificing four Cordyceps Infected tokens, dealing 4 damage to Abby.
Abby dies as a state-based action due to having 0 toughness. Choose to return it to the command zone from your graveyard.
Activate Phyrexian Altar twice by sacrificing two Cordyceps Infected tokens, adding {R}{G}.
Repeat.

Infinite LTB

Infinite ETB

Infinite colored mana

Infinite sacrifice triggers

Infinite death triggers

Infinite colorless mana

Infinite damage

Infinite storm count

Infinite creature tokens

Infinite commander casts

Abby, Merciless Soldier

Mana Echoes

Phyrexian Altar

Goblin Bombardment

Cast Abby from the command zone by paying {1}{R}{G} plus commander tax.
Abby triggers, creating a number of 1/1 Cordyceps Infected creature tokens.
When the Cordyceps Infected tokens enter, Mana Echoes triggers that many times, adding {C} for each Fungus and/or Zombie you control for each trigger.
Resolve Abby, giving control of it to an opponent.
Activate Goblin Bombardment four times by sacrificing four Cordyceps Infected tokens.
When the Cordyceps Infected tokens die, Pitiless Plunderer triggers four times, creating four Treasure tokens.
Resolve the Goblin Bombardment abilities, dealing 4 damage to Abby.
Abby dies as a state-based action due to having 0 toughness. Choose to return it to the command zone from your graveyard.
Activate two Treasures by tapping and sacrificing them, adding {R}{G}.
Repeat.

Infinite Treasure tokens

Pitiless Plunderer

Cast Abby from the command zone by paying {1}{R}{G} plus commander tax.
Abby triggers, creating a number of 1/1 Cordyceps Infected creature tokens.
Resolve Abby, giving control of it to an opponent.
Activate Goblin Bombardment four times by sacrificing four Cordyceps Infected tokens, dealing 4 damage to Abby.
Abby dies as a state-based action due to having 0 toughness. Choose to return it to the command zone from your graveyard.
When the Cordyceps Infected tokens die, Pitiless Plunderer triggers four times, creating four Treasure tokens.
Activate the Treasures by tapping and sacrificing them, adding {2}{R}{G}.
Activate Ashnod's Altar by sacrificing a Cordyceps Infected token, adding {C}{C}.
When the Cordyceps Infected token dies, Pitiless Plunderer triggers, creating a Treasure token.
Activate a Treasure by tapping and sacrificing it, adding {1}.
Repeat from step 8 until you control no Cordyceps Infected tokens and/or have enough mana to cast Abby.
Repeat from step 1.

Ashnod's Altar

Combos with "Abby, Merciless Soldier"