Clockwork Hydra + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Phantom Train

WB identity

Commander legal

The 3 combo pieces

• Clockwork Hydra
• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
• Phantom Train

How to execute it

1. Activate Phantom Train by sacrificing Clockwork Hydra.
2. When Clockwork Hydra dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect.
3. Resolve the Phantom Train ability.
4. Repeat.

What the combo produces

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