Necrotic Ooze, Triskelion, and Phyrexian Devourer

Prerequisites

• Necrotic Ooze on the battlefield
• Triskelion in the graveyard
• Phyrexian Devourer in the graveyard
• The combined mana value of cards in your library is greater than or equal to the sum of your opponents' life totals

Steps

1. Activate Necrotic Ooze using Phyrexian Devourer's ability by exiling the top card of your library, putting a number of +1/+1 counters on Necrotic Ooze equal to the card's mana value
2. Repeat step 1 until the number of +1/+1 counters on Necrotic Ooze is at least equal to the sum of your opponents' life totals
3. Activate Necrotic Ooze using Triskelion's ability by removing a +1/+1 counter from it, dealing 1 damage to any target
4. Repeat step 3 until all opponents have taken lethal damage

Results

• Near-infinite damage