Marvin, Murderous Mimic + Phyrexian Devourer + Walking Ballista

C identity

Commander legal

The 3 combo pieces

• Marvin, Murderous Mimic
• Phyrexian Devourer
• Walking Ballista

How to execute it

1. Activate 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. Repeat step 1 as desired or until you have an empty library.
3. Activate Marvin using Walking Ballista's second ability by removing a +1/+1 counter from Marvin, dealing 1 damage to any target.
4. Repeat step 3 as desired.

What the combo produces

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