Outrider en-Kor, Task Force, and Diamond Valley

Prerequisites

• Outrider en-Kor on the battlefield
• Task Force on the battlefield
• Diamond Valley on the battlefield
• Diamond Valley must be untapped

Steps

1. Pay to activate Outrider en-Kor, targeting Task Force
2. Task Force triggers, giving itself +0/+3 untill end of turn
3. Repeat steps 1-2 untill Task Force has infinite toughness
4. Tap Diamond Valley sacrificing Task Force, gaining life equal to its toughness

Results

• Infinite lifegain