Delina, Wild Mage, Coretapper, and Magistrate's Scepter

Prerequisites

• Delina, Wild Mage on the battlefield
• Coretapper on the battlefield
• Magistrate's Scepter on the battlefield
• Coretapper does not have summoning sickness
• Delina does not have summoning sickness
• An opponent cannot block and kill Delina

Steps

1. Activate Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter
2. Declare Delina as an attacker
3. Delina triggers, creating at least one token copy of Coretapper that is tapped and attacking
4. Activate a Coretapper token's second ability by sacrificing it, putting two charge counters on Magistrate's Scepter
5. If you control any other Coretapper tokens, you may repeat step 4 as desired for each of them
6. Activate Magistrate's Scepter's second ability by tapping it and removing three charge counters from it, taking an extra turn after this one
7. Repeat each turn

Results

• Infinite turns