Mairsil, the Pretender, Ventifact Bottle, Magistrate's Scepter, and Horseshoe Crab

Prerequisites

• Mairsil, the Pretender on the battlefield
• Ventifact Bottle in exile
• Magistrate's Scepter in exile
• Horseshoe Crab in exile
• Mairsil does not have summoning sickness
• each turn available

Steps

1. Activate Mairsil using Ventifact Bottle's ability by paying and tapping it, putting three +1/+1 counters on Mairsil
2. Activate Mairsil using Horseshoe Crab's ability by paying , untapping itself
3. Activate Mairsil using Magistrate's Scepter's last ability by tapping it, gaining an extra turn after this one
4. Move to your next turn
5. Repeat

Results

• Infinite turns