Heartless Hidetsugu, and Vizkopa Guildmage

Prerequisites

• Heartless Hidetsugu on the battlefield
• Vizkopa Guildmage on the battlefield
• Heartless Hidetsugu does not have summoning sickness
• available

Steps

1. Activate Vizkopa Guildmage's first ability by paying , giving Heartless Hidetsugu lifelink until end of turn
2. Activate Vizkopa Guildmage's second ability by paying , creating a delayed triggered ability
3. Activate Heartless Hidetsugu's ability by tapping it, causing Heartless Hidetsugu to deal damage to each player equal to half their life total and causing you to gain life equal to the damage dealt
4. The delayed triggered ability from step 2 triggers, causing each opponent to lose life equal to the amount of life you gained

Results

• Lethal lifeloss to each opponent
• Near-infinite lifegain