Bolas's Citadel + Mortuary + Stonecoil Serpent

B identity

Commander legal

The 3 combo pieces

How to execute it

  1. Cast Stonecoil Serpent either from your hand by paying {0} or from the top of your library by paying 0 life.
  2. Stonecoil Serpent enters and dies as a state-based action due to having 0 toughness.
  3. Mortuary triggers, putting Stonecoil Serpent from your graveyard onto the top of your library.
  4. Repeat.

What the combo produces