Magistrate's Scepter + Coretapper + Contagion Engine

Prerequisites

• Coretapper does not have summoning sickness.

Steps

1. 1Activate Coretapper's first ability by tapping it, putting a charge counter on Magistrate's Scepter.
2. 2Activate Contagion Engine by paying and tapping it, proliferating twice, putting two additional charge counters on Magistrate's Scepter.
3. 3Activate Magistrate's Scepter's second ability by tapping it and removing three charge counters from it, taking an extra turn after this one.
4. 4Repeat each turn.

Effects

• Infinite turns
• Lock