Altar of Dementia + Arbor Adherent + Intruder Alarm + Sin, Unending Cataclysm

Mana needed: {5}{G}{G/U}{U} plus commander tax if applicable

GU identity

Commander legal

The 4 combo pieces

What must be in place

You control a creature with toughness X or greater.
There are at least X counters on artifacts, creatures and/or enchantments you control, where X is 3 plus the number of times you've cast Sin from the command zone this game.

How to execute it

  1. Cast Sin either from your hand or command zone by paying {5}{G}{U} plus commander tax if applicable.
  2. As Sin enters, remove all counters from all artifacts, enchantments and creatures you control, putting twice that many +1/+1 counters on Sin.
  3. When Sin enters, Intruder Alarm triggers, untapping all creatures.
  4. Activate Arbor Adherent by tapping it, adding an amount of {G} or {U} equal to Sin's toughness.
  5. Activate Altar of Dementia by sacrificing Sin.
  6. Choose to return Sin to the command zone from your graveyard.
  7. When Sin dies, it triggers, putting its counters on Arbor Adherent.
  8. Resolve the Altar of Dementia ability.
  9. Repeat.

What the combo produces