Bolas's Citadel + Chamber Sentry + Mortuary

WUBRG identity

Commander legal

The 3 combo pieces

How to execute it

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

What the combo produces