Commander Goblins R - Krenko, Mob Boss (EDH / Commander)

Krenko, Mob Boss + Mana Echoes + Skirk Prospector + Goblin Warchief

Requires
Krenko, Mob Boss must be on the battlefield. Mana Echoes must be on the battlefield. Skirk Prospector must be on the battlefield. Goblin Warchief must be on the battlefield. There is a number of additional Goblins on the battlefield equal to or greater than the number of times you've cast Krenko from the command zone this game minus three.
Steps
Activate Krenko by tapping it, creating a 1/1 Goblin creature token for each Goblin you control.
When the Goblins enter the battlefield, Mana Echoes triggers that many times.
Resolve the first trigger, adding c for each Goblin on the battlefield.
Repeat step 3 for each remaining trigger.
Activate Skirk Prospector twice by sacrificing Krenko and a Goblin token, adding rr.
Choose to return Krenko to the command zone from your graveyard.
Cast Krenko from the command zone by paying 1rr plus commander tax, if applicable.
When Krenko enters the battlefield, Mana Echoes triggers, adding c for each Goblin and Warrior on the battlefield.
Repeat.
Results
Infinite colorless mana. Infinite commander casts. Infinite creature tokens. Infinite creature tokens with haste. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite red mana. Infinite sacrifice triggers. Infinite storm count.

Krenko, Mob Boss + Mana Echoes + Skirk Prospector + Goblin Chieftain

Skirk Prospector + Pashalik Mons + Mana Echoes

Krenko, Mob Boss + Skirk Prospector + Mass Hysteria + Mana Echoes