Altar of Dementia + Elemental Mastery + Galvanic Juggernaut

R identity

Commander legal

The 3 combo pieces

What must be in place

Elemental Mastery attached to Galvanic Juggernaut.
Galvanic Juggernaut does not have summoning sickness.

How to execute it

  1. Activate Galvanic Juggernaut by tapping it, creating five 1/1 Elemental creature tokens with haste.
  2. Activate Altar of Dementia by sacrificing an Elemental.
  3. The Elemental dies, triggering Galvanic Juggernaut, untapping Galvanic Juggernaut.
  4. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the Elemental's power.
  5. Repeat.

What the combo produces