Ghave, Guru of Spores, Geralf's Messenger, and Ashnod's Altar

Prerequisites

• Ghave, Guru of Spores on the battlefield
• Geralf's Messenger on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Geralf's Messenger, adding
2. Geralf's Messenger undying ability triggers, returning it to the battlefield with al +1/+1 counter on it
3. Geralf's Messnger's ETB ability triggers, causing target opponent to lose 2 life
4. Activate Ghave's first ability by paying and removing a +1/+1 counter from Geralf's Messenger, creating a 1/1 Saproling creature token
5. Repeat

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite lifeloss
• Infinite LTB
• Infinite sacrifice triggers
• Infinite +1/+1 counters