Task Force, Animal Boneyard, and Lancers en-Kor

Prerequisites

• Task Force on the battlefield
• Animal Boneyard on the battlefield
• Lancers en-Kor on the battlefield

Steps

1. Activate Lancers en-Kor by paying
2. Task Force triggers, giving it +0/+3 until end of turn
3. Repeat an arbitrarily large number of times
4. Activate the land with Animal Boneyard attached by tapping it and sacrificing Task Force, causing you to gain life equal to Task Force's toughness

Results

• Infinite lifegain