Ob Nixilis, Unshackled
Field of Ruin
Rings of Brighthearth
Crucible of Worlds

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
You must have a land drop available. Four nonbasic lands under opponents' control.
8 available

   Steps

How does this combo work?
1
Activate Field, targeting a land and triggering Rings of Brighthearth.
2
Pay to copy the Field effect, targeting a different land.
3
Resolve both triggers and the resulting Ob Nixilis triggers, forcing all opponent to lose 20 life.
4
Use Crucible of Worlds to play Field.
5
Repeat steps 1-3.

   Results

What do I get from this combo?
Each opponent loses 40 life
Ob Nixilis, Unshackled
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Maralen of the Mornsong
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Zask, Skittering Swarmlord
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Sidar Jabari of Zhalfir
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Soul of Windgrace
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