Deathbringer Thoctar, and Archangel of Thune

Prerequisites

• Deathbringer Thoctar on the battlefield
• Archangel of Thune on the battlefield
• You have a way to give Deathbringer Thoctar lifelink
• Deathbringer Thoctar has at least one +1/+1 counter on it

Steps

1. Give Deathbringer Thoctar lifelink, if needed
2. Activate Deathbringer Thoctar by removing a +1/+1 counter from it, dealing 1 damage to any target and causing you to gain 1 life
3. Archangel of Thune triggers, putting a +1/+1 counter on each creature you control
4. Repeat from step 2

Results

• Infinite +1/+1 counters on all creatures you control except Deathbringer Thoctar
• Infinite damage
• Infinite lifegain
• Infinite lifegain triggers