Zagras, Thief of Heartbeats, Dread Slaver, Flayer of the Hatebound, and Mikaeus, the Unhallowed

Prerequisites

• Zagras, Thief of Heartbeats on the battlefield
• Dread Slaver on the battlefield
• Flayer of the Hatebound on the battlefield
• Mikaeus, the Unhallowed on the battlefield
• You have a way to kill Dread Slaver

Steps

1. Kill Dread Slaver
2. When Dread Slaver dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
3. When Dread Slaver enters the battlefield, Flayer of the Hatebound triggers, causing Dread Slaver to deal damage to itself equal to its power
4. Dread Slaver dies as a state-based action due to its deathtouch
5. Dread Slaver triggers, returning itself from your graveyard to the battlefield
6. Repeat from step 3

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB