Mikaeus, the Unhallowed, Champion of the Weird, and Angelic Chorus

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Champion of the Weird on the battlefield
• Angelic Chorus on the battlefield

Steps

1. Activate Champion of the Weird's ability by paying 1 life and putting two -1/-1 counters on it
2. If Champion of the Weird does not die as a state-based action due to having 0 or less toughness, resolve the ability from step 1, causing an opponent to blight 2, and continue activating the ability until Champion of the Weird dies
3. When Champion of the Weird dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
4. When Champion of the Weird enters, Angelic Chorus triggers, causing you to gain 7 life
5. Resolve the Champion of the Weird ability from step 1, causing an opponent to blight 2 Repeat

Results

• Infinite -1/-1 counters
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite lifegain
• Infinite lifegain triggers