Woodfall Primus, Melira, Sylvok Outcast, and Ashnod's Altar

Prerequisites

• Woodfall Primus on the battlefield
• Melira, Sylvok Outcast on the battlefield
• Ashnod's Altar on the battlefield
• Woodfall Primus does not have a -1/-1 counters on it

Steps

1. Activate Ashnod's Altar by sacrificing Woodfall Primus, adding
2. Woodfall Primus's persist ability triggers, returning it to the battlefield
3. Woodfall Primus enters the battlefield, triggering its ability
4. Holding priority, repeat an arbitrarily large number of times
5. Resolve all Woodfall Primus abilities, destroying any number of noncreature permanents
6. Repeat

Results

• Destroy any number of noncreature permanents
• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers