Reyhan, Last of the Abzan, Phyrexian Altar, Herd Baloth, and Bioengineered Future

Prerequisites

• Reyhan, Last of the Abzan on the battlefield
• Phyrexian Altar on the battlefield
• Herd Baloth in hand
• Bioengineered Future on the battlefield
• available

Steps

1. Cast Herd Baloth by paying its mana cost, causing it to enter with +1/+1 counter(s) due to Bioengineered Future
2. When Herd Baloth enters, it triggers, creating a creature token that enters with +1/+1 counter(s) due to Bioengineered Future
3. Activate Phyrexian Altar by sacrificing the creature token
4. When the creature token dies, Reyhan triggers, putting +1/+1 counter(s) on Herd Baloth Herd Baloth triggers, creating a creature token that enters with +1/+1 counter(s) due to Bioengineered Future
5. Repeat from step 3

Results

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