Enter the Unknown + Mystic Sanctuary + Bolas's Citadel + Overgrown Estate + Icetill Explorer

Enter the Unknown

Mystic Sanctuary

Bolas's Citadel

Overgrown Estate

Icetill Explorer

How it works

1. Cast Enter the Unknown either from your hand by paying 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, putting Enter the Unknown from your graveyard onto the top of your library.
4. Activate Mystic Sanctuary by tapping it, adding .
5. Activate Overgrown Estate by sacrificing Mystic Sanctuary, causing you to gain 3 life.
6. Repeat.

This ingenious loop lets you continuously recast Enter the Unknown from the top of your library using Bolas's Citadel, bypassing traditional mana costs by paying life instead while Icetill Explorer ensures you can freely play lands from your graveyard. As you play Mystic Sanctuary, its landfall-style trigger puts Enter the Unknown right back on top of your library, and you can tap the Sanctuary for blue mana before sacrificing it to Overgrown Estate to gain life. Because Icetill Explorer also grants an additional land drop, you have all the recursion and life-buffer necessary to fuel the Citadel's health costs indefinitely.