Red Hulk, Spitemare, and Flawless Maneuver

Prerequisites

• Red Hulk on the battlefield
• Spitemare on the battlefield
• Flawless Maneuver in hand
• if you don't control your commander available

Steps

1. Give Red Hulk and Spitemare indestructible using Flawless Maneuver
2. Deal damage to Red Hulk
3. Red Hulk triggers, putting a +1/+1 counter on it and dealing damage to Spitemare
4. Spitemare triggers, dealing damage to Red Hulk
5. Repeat from step 3

Results

• Infinite +1/+1 counters on a creature
• Infinite damage to one opponent