Omnath, Locus of Creation + Doppelgang + Mystic Sanctuary Combo

Doppelgang in hand.

Omnath and Mystic Sanctuary on the battlefield.

available

Cast Doppelgang by paying , creating two token copies of Omnath and Mystic Sanctuary.

Put all but one of the newest Omnath tokens into your graveyard due to the legend rule.

Each Mystic Sanctuary token created triggers, each Omnath you controlled prior to step 2's second abilities trigger twice, and each of the created Omnath token's first abilities trigger once.

Resolve both Mystic Sanctuary abilities, putting Doppelgang and up to one other instant or sorcery from your graveyard onto the top of your library.

Resolve both Omnath tokens' first triggers, causing you to draw two cards, including Doppelgang.

Resolve the remaining Omnath triggers, causing you to gain 8 life, add , and perform other actions dependent on how many times the specific abilities have triggered that turn.

Repeat.

Infinite card draw

Significant creature ETB

Significant creature LTB

Significant blue mana

Significant copies of all permanents

Significant damage

Significant death triggers

Significant green mana

Significant landfall triggers

Significant lifegain

Significant lifegain triggers

Significant magecraft triggers

Significant mana permanents you control can produce

Significant red mana

Significant white mana