Rhys, the Evermore, Reveillark, Solemnity, and Phantom Train

Prerequisites

• Rhys, the Evermore in hand
• Reveillark on the battlefield
• Solemnity on the battlefield
• Phantom Train on the battlefield
• available

Steps

1. Cast Rhys by paying When Rhys enters, it triggers, giving Reveillark persist until end of turn
2. Activate Phantom Train by sacrificing Rhys
3. Activate Phantom Train by sacrificing Reveillark
4. When Reveillark dies, its ability and its persist ability trigger
5. Resolve the persist trigger, returning Reveillark from your graveyard to the battlefield without a -1/-1 counter on it due to Solemnity
6. Resolve the second trigger, returning Rhys from your graveyard to the battlefield
7. When Rhys enters, it triggers, giving Reveillark persist until end of turn
8. Resolve the Phantom Train ability from step 4
9. Repeat from step 3

Results

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