Mirrorwing Dragon, Venerated Rotpriest, and Storm Herd

Prerequisites

• Mirrorwing Dragon on the battlefield
• Venerated Rotpriest on the battlefield
• Storm Herd in hand
• You have an instant or sorcery card in hand that can target a single creature
• Your life total is equal to or greater than ten times the number of opponents you have, minus two, and minus an additonal one for each poison counter your opponents have
• plus enough mana to cast the instant or sorcery available

Steps

1. Cast Storm Herd by paying , creating a number of 1/1 Pegasus creature tokens equal to your life total
2. Cast any instant or sorcery by paying its mana cost, targeting Mirrorwing Dragon
3. Mirrorwing Dragon and Venerated Rotpriest trigger
4. Resolve the Venerated Rotpriest trigger, causing an opponent to get a poison counter
5. Resolve the Mirrorwing Dragon trigger, copying the spell for each other creature you control, with each copy targeting a different creature
6. Venerated Rotpriest triggers for each copy made this way
7. Resolve the first trigger, causing an opponent to get a poison counter
8. If the opponent has ten poison counters, they lose the game
9. Repeat from step 7 for each remaining trigger

Results

• Each opponent loses the game