Reyhan, Last of the Abzan, Ashnod's Altar, Herd Baloth, and Railway Brawler

Prerequisites

• Reyhan, Last of the Abzan on the battlefield
• Ashnod's Altar on the battlefield
• Herd Baloth in hand
• Railway Brawler on the battlefield
• available

Steps

1. Cast Herd Baloth by paying its mana cost
2. When Herd Baloth enters, Railway Brawler triggers, putting +1/+1 counter(s) on Herd Baloth Herd Baloth triggers, creating a creature token
3. When the creature token enters, Railway Brawler triggers, putting +1/+1 counter(s) on it
4. Activate Ashnod's Altar by sacrificing the creature token
5. When the creature token dies, Reyhan triggers, putting +1/+1 counter(s) on Herd Baloth Repeat from step 3

Results

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