Krenko, Mob Boss, Umbral Mantle, and Ashnod's Altar

Prerequisites

• Krenko, Mob Boss on the battlefield
• Umbral Mantle on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Krenko by tapping it, creating at least two 1/1 Goblin creature tokens
2. Activate Ashnod's Altar twice by sacrificing two Goblin tokens, adding
3. Activate Krenko by paying and untapping it, giving it +2/+2 until end of turn
4. Repeat

Results

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