Necrotic Ooze, Phyrexian Devourer, and Deathbringer Thoctar

Prerequisites

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

Steps

1. Activate Phyrexian Devourer's ability repeatedly to exile your entire library, adding a number of counter to it equal to the mana value of the exiled cards
2. Use Deathbringer Thoctar's ability to remove +1/+1 counters to deal 1 damage to any target until your opponent are dead

Results

• Near-infinite damage