Doomgape, Serra Avatar, and Professor Dellian Fel

Prerequisites

• Doomgape on the battlefield
• Serra Avatar on the battlefield
• Professor Dellian Fel on the battlefield or in the graveyard

Steps

1. At the beginning of your upkeep, Doomgape triggers, causing you to sacrifice Serra Avatar and gain life equal to its toughness
2. Professor Dellian Fel's emblem triggers, causing an opponent to lose life equal to the life you gained

Results

• Near-infinite lifegain
• Near-infinite lifeloss for target opponent