Krenko, Mob Boss, Skirk Prospector, and Umbral Mantle

Prerequisites

• Krenko, Mob Boss on the battlefield
• Skirk Prospector on the battlefield
• Umbral Mantle on the battlefield

Steps

1. Activate Krenko by tapping it, creating at least three 1/1 Goblin creature tokens
2. Activate Skirk Prospector three times by sacrificing three Goblin tokens, adding
3. Activate Krenko by paying and untapping it, giving it +2/+2 until end of turn
4. Repeat

Results

• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite red mana
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinitely large creature until end of turn