Metamorphosis Fanatic + Phantom Train + Prowling Geistcatcher

B identity

Commander legal

The 3 combo pieces

• Metamorphosis Fanatic
• Phantom Train
• Prowling Geistcatcher

How to execute it

1. Activate Phantom Train by sacrificing Metamorphosis Fanatic.
2. When Metamorphosis Fanatic dies, Prowling Geistcatcher's first ability triggers, exiling Metamorphosis Fanatic from your graveyard.
3. Resolve the Phantom Train ability.
4. Activate Phantom Train by sacrificing Prowling Geistcatcher.
5. When Prowling Geistcatcher dies, its second ability triggers, returning Metamorphosis Fanatic from exile to the battlefield.
6. When Metamorphosis Fanatic enters the battlefield, it triggers, returning Prowling Geistcatcher from your graveyard to the battlefield.
7. Resolve the Phantom Train ability.
8. Repeat.

What the combo produces

• Infinite +1/+1 counters on a creature
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers