Champion of the Weird, Geralf's Messenger, and Kheru Bloodsucker

Prerequisites

• Champion of the Weird on the battlefield
• Geralf's Messenger on the battlefield
• Kheru Bloodsucker on the battlefield

Steps

1. Activate Champion of the Weird by paying 1 life and putting two -1/-1 counters on Geralf's Messenger
2. Geralf's Messenger dies due to having 0 toughness, triggering its undying ability and Kheru Bloodsucker Resolve the Kheru Bloodsucker trigger, causing you to gain 2 life and causing an opponent to lose 2 life
3. Resolve the Geralf's Messenger trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it
4. Resolve the Champion of the Weird ability from step 1, causing an opponent to blight 2
5. Activate Champion of the Weird by paying 1 life and putting two -1/-1 counters on Geralf's Messenger, causing an opponent to blight 2
6. Repeat

Results

• Infinite -1/-1 counters
• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite creature sacrifice triggers