World Shaper | Glacial Chasm | Mortuary Mire (and one other card)

Cards

While
Glacial Chasm is on the battlefield, all damage that would be dealt to you is prevented.
At the beginning of your upkeep,
Glacial Chasm triggers. Choose not to pay its cumulative upkeep cost and sacrifice it.
Activate
Umbral Collar Zealot by sacrificing
World Shaper.
When
World Shaper dies, its second ability triggers, returning
Glacial Chasm and
Mortuary Mire from your graveyard to the battlefield tapped.
When
Glacial Chasm and
Mortuary Mire enter, they each trigger.
Resolve the
Glacial Chasm trigger, sacrificing
Mortuary Mire.
Resolve the
Mortuary Mire trigger, putting
World Shaper from your graveyard onto the top of your library.
Resolve the
Umbral Collar Zealot ability from step 3.
Move to your next turn, drawing
World Shaper during your draw step.
At the beginning of your upkeep,
Glacial Chasm triggers. Choose not to pay its cumulative upkeep cost and sacrifice it.
Cast
World Shaper by paying ({3} magic symbol) ({G} magic symbol) .
Repeat from step 3.

If your life total allows, you can instead opt to pay
Glacial Chasm's cumulative upkeep cost. If you do this, you can forego doing this loop during that turn.

This combo has been estimated to be Spicy (Bracket 3-4+).