Doomgape, Serra Avatar, and Vizkopa Guildmage

Prerequisites

• Doomgape on the battlefield
• Serra Avatar on the battlefield
• Vizkopa Guildmage on the battlefield
• undefined available

Steps

1. At the beginning of your upkeep, Doomgape triggers
2. Holding priority, activate Vizkopa Guildmage's second ability by paying
3. Resolve the Doomgape trigger, causing you to sacrifice Serra Avatar and gain life equal to its toughness
4. Vizkopa Guildmage triggers, causing each opponent to lose life equal to the life you gained

Results

• Near-infinite lifegain
• Near-infinite lifeloss