Kykar, Wind's Fury, Solemnity, and Howlgeist

Prerequisites

• Kykar, Wind's Fury on the battlefield
• Solemnity on the battlefield
• Howlgeist on the battlefield

Steps

1. Activate Kykar by sacrificing Howlgeist, adding
2. Howlgeist dies, triggering its undying ability, returning it from your graveyard to the batltefield without a +1/+1 counter on it due to Solemnity
3. Repeat

Results

• Infinite death triggers
• Infinite creature ETB
• Infinite creature LTB
• Infinite red mana
• Infinite creature sacrifice triggers