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

Prerequisites

• You must have a land drop available.
• Four nonbasic lands under opponents' control.

Steps

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

Effects

• Near-infinite lifeloss