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.
Play Mystic Sanctuary either from your hand or graveyard.
When Mystic Sanctuary enters the battlefield untapped, it triggers, putting Enter the Unknown from your graveyard onto the top of your library.
Activate Mystic Sanctuary by tapping it, adding {U}.
Activate Zuran Orb by sacrificing Mystic Sanctuary, causing you to gain 2 life.
Repeat.

Infinite lifegain triggers

Infinite lifegain

Infinite storm count

Infinite blue mana

Infinite magecraft triggers

Infinite +1/+1 counters

Infinite landfall triggers

Enter the Unknown

Mystic Sanctuary

Bolas's Citadel

Zuran Orb

Icetill Explorer

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.
Play Mystic Sanctuary either from your hand or graveyard.
When Mystic Sanctuary enters the battlefield untapped, it triggers, putting Enter the Unknown from your graveyard onto the top of your library.
Activate Mystic Sanctuary by tapping it, adding {U}.
Activate Overgrown Estate by sacrificing Mystic Sanctuary, causing you to gain 3 life.
Repeat.

Overgrown Estate

Combos with "Enter the Unknown"