Ancient Greenwarden + Bolas's Citadel + Enter the Unknown + and 2 others

Mana needed: {G} if Enter the Unknown is in your hand

GWUB identity

Commander legal

The 5 combo pieces

What must be in place

You control three or more Islands.

How to execute it

  1. Cast Enter the Unknown either from your hand by paying {G} or from the top of your library by paying 1 life, causing a creature you control to explore and allowing you to play an additional land this turn.
  2. Play Mystic Sanctuary either from your hand or graveyard.
  3. When Mystic Sanctuary enters the battlefield untapped, it triggers twice, putting Enter the Unknown from your graveyard onto the top of your library.
  4. Activate Mystic Sanctuary by tapping it, adding {U}.
  5. Activate Overgrown Estate by sacrificing Mystic Sanctuary, causing you to gain 3 life.
  6. Repeat.

What the combo produces