Tetravus + Sage of Hours + Cathars' Crusade

Prerequisites

• Tetravus has at least five +1/+1 counters on it.

Steps

1. 1At the beginning of your upkeep, Tetravus' first and second abilities trigger.
2. 2Resolve Tetravus' second ability, choosing not to exile any tokens.
3. 3Resolve Tetravus' first ability, causing you to remove five +1/+1 counters from Tetravus to create five 1/1 Tetravite creature tokens.
4. 4The Tetravites enter the battlefield, triggering Cathars' Crusade five times, putting five +1/+1 counters on each creature you control.
5. 5Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least one extra turn after this one.
6. 6Repeat each turn.

Effects

• Infinite turns
• Lock