Tana, the Bloodsower, Sage of Hours, and Cathars' Crusade

Prerequisites

• Tana, the Bloodsower on the battlefield
• Sage of Hours on the battlefield
• Cathars' Crusade on the battlefield
• Tana has power five or greater, does not have summoning sickness and cannot be blocked by an opponent

Steps

1. Deal combat damage to an opponent using Tana
2. Tana triggers, creating at least five 1/1 Saproling creature tokens
3. When the Saprolings enter the battlefield, Cathars' Crusade triggers that many times, putting that many +1/+1 counters on each creature you control
4. Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least one extra turn after this one
5. Repeat each turn

Results

• Infinite turns