Coalhauler Swine, and Dawnsire, Sunstar Dreadnought

Prerequisites

• Coalhauler Swine on the battlefield
• Dawnsire, Sunstar Dreadnought on the battlefield

Steps

1. Declare any creature as an attacker, triggering Dawnsire, dealing 100 damage to Coalhauler Swine
2. Coalhauler Swine triggers, dealing 100 damage to each player and causing you to gain life equal to the amount of damage dealt this way due to its lifelink

Results

• Near-infinite lifegain
• Near-infinite damage