Tekuthal, Inquiry Dominus + Magistrate's Scepter + Contagion Engine

Prerequisites

• Magistate's Scepter has at least one charge counter on it.

Steps

1. 1Activate Contagion Engine by paying and tapping it, putting four charge counters on Magistrate's Scepter.
2. 2Activate Magistrate's Scepter's second ability by tapping it and removing three charge counters from it, causing you to take an extra turn after this one.
3. 3Repeat each turn.

Effects

• Infinite turns
• Lock