Unspeakable Symbol, Sage of Hours, Gray Merchant of Asphodel, and Soulherder

Prerequisites

• Unspeakable Symbol on the battlefield
• Sage of Hours on the battlefield
• Gray Merchant of Asphodel on the battlefield
• Soulherder on the battlefield
• Your devotion to black times the number of opponents you have is greater than or equal to 15

Steps

1. At the beginning of your end step, Soulherder's second ability triggers, blinking Gray Merchant of Asphodel
2. Soulherder's first ability and Gray Merchant of Asphodel trigger
3. Resolve the Soulherder trigger, putting a +1/+1 counter on it
4. Resolve the Gray Merchant of Asphodel trigger, causing each opponent to lose life equal to your devotion to black, and you to gain life equal to the life lost this way
5. Activate Unspeakable Symbol five times by paying 15 life, putting five +1/+1 counters on Sage of Hours
6. Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least one extra turn after this one
7. Repeat each turn

Results

• Infinite turns