Necrotic Ooze + Walking Ballista + Phyrexian Devourer

Prerequisites

• The combined mana value of cards in your library is greater than or equal to the sum of your opponents' life totals.

Steps

1. 1Activate Necrotic Ooze's 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. 2Repeat 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. 3Activate Necrotic Ooze using Walking Ballista's last ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
4. 4Repeat step 3 until all opponents have taken lethal damage.

Effects

• Near-infinite damage