Altar of Dementia + Arbor Adherent + Intruder Alarm + Sin, Unending Cataclysm
Altar of Dementia
Artifact
Arbor Adherent
Creature — Dog Druid
Intruder Alarm
Enchantment
Sin, Unending Cataclysm
Legendary Creature — Leviathan Avatar
Result
- Infinite creature LTB
- Infinite creature ETB
- Infinite colored mana
- Infinite creature sacrifice triggers
- Infinite death triggers
- Infinite mill
- Infinite self-mill
- Infinite storm count
- Infinite mana creatures you control can produce
- Infinite untap of creatures
- Infinite commander casts
- Infinite +1/+1 counters on a creature
Combo data from Commander Spellbook.