Krenko, Mob Boss, Umbral Mantle, and Phyrexian Altar

Prerequisites

• Krenko, Mob Boss on the battlefield
• Umbral Mantle on the battlefield
• Phyrexian Altar on the battlefield
• You control at least two additional Goblins
• Krenko does not have summoning sickness
• Umbral Mantle attached to Krenko

Steps

1. Activate Krenko by tapping it, creating at least three 1/1 Goblin creature tokens
2. Activate Phyrexian Altar three times by sacrificing three Goblins, adding
3. Activate Krenko by paying and untapping it, giving it +2/+2 until end of turn
4. Repeat
5. If you control four or more Goblins as this combo begins, this combo nets infinite mana

Results

• Infinite colored mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinitely large Krenko until end of turn
• Infinite sacrifice triggers