Krenko, Mob Boss, Mana Echoes, Skirk Prospector, and Thousand-Year Elixir

Prerequisites

• Krenko, Mob Boss on the battlefield
• Mana Echoes on the battlefield
• Skirk Prospector on the battlefield
• Thousand-Year Elixir 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 two

Steps

1. Activate Krenko by tapping it, creating a 1/1 Goblin creature token for each Goblin you control
2. When the Goblins enter the battlefield, Mana Echoes triggers that many times
3. Resolve the first trigger, adding for each Goblin on the battlefield
4. Repeat step 3 for each remaining trigger
5. Activate Skirk Prospector twice by sacrificing Krenko and a Goblin token, adding
6. Choose to return Krenko to the command zone from your graveyard
7. Cast Krenko from the command zone by paying plus commander tax, if applicable
8. When Krenko enters the battlefield, Mana Echoes triggers, adding for each Goblin and Warrior on the battlefield
9. Repeat

Results

• Infinite colorless mana
• Infinite commander casts
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite red mana
• Infinite sacrifice triggers
• Infinite storm count