Marvin, Murderous Mimic + Phyrexian Devourer + Walking Ballista

Prerequisites

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Steps

1. 1Activate Marvin using Phyrexian Devourer's ability by exiling the top card of your library, putting a number of +1/+1 counters on Marvin equal to the exiled card's mana value.
2. 2Repeat step 1 as desired or until you have an empty library.
3. 3Activate Marvin using Walking Ballista's second ability by removing a +1/+1 counter from Marvin, dealing 1 damage to any target.
4. 4Repeat step 3 as desired.

Effects

• Exile your library
• Near-infinite +1/+1 counters on a creature
• Near-infinite damage