Ghave, Guru of Spores, Cryptic Trilobite, Strangleroot Geist, and Corpse Knight

Prerequisites

• Ghave, Guru of Spores on the battlefield
• Cryptic Trilobite on the battlefield
• Strangleroot Geist on the battlefield
• Corpse Knight on the battlefield
• Strangleroot Geist does not have a +1/+1 counter on it
• available

Steps

1. Activate Ghave's second ability by paying and sacrificing Strangleroot Geist
2. Strangleroot Geist's undying ability triggers, returning Strangleroot Geist from your graveyard to the battlefield with a +1/+1 counter on it
3. Strangleroot Geist enters the battlefield triggering Corpse Knight, causing each opponent to lose 1 life
4. Resolve the Ghave ability, putting a +1/+1 counter on Cryptic Trilobite
5. Activate Cryptic Trilobite by removing a +1/+1 counter from it, adding that can only be spent to activate abilities
6. Activate Ghave's first ability by paying and removing a +1/+1 counter from Strangleroot Geist, creating a 1/1 Saproling creature token
7. The Saproling token enters the battlfield triggering Corpse Knight, causing each opponent to lose 1 life
8. Repeat

Results

• Infinite +1/+1 counters on creatures you control
• Infinite colorless mana that can only be spent to activated abilities
• Infinite creature tokens
• Infinite ETB
• Infinite lifeloss
• Infinite LTB