Ashiok's Reaper + Hypnotic Siren + Mortuary + Phyrexian Altar

UB identity

Commander legal

The 4 combo pieces

• Ashiok's Reaper
• Hypnotic Siren
• Mortuary
• Phyrexian Altar

How to execute it

1. Activate Phyrexian Altar by sacrificing Hypnotic Siren, adding {U}.
2. When Hypnotic Siren dies, Mortuary and Ashiok's Reaper trigger.
3. Resolve the Mortuary trigger, putting Hypnotic Siren on top of your library from your graveyard.
4. Resolve the Ashiok's Render trigger, causing you to draw Hypnotic Siren from your library.
5. Cast Hypnotic Siren by paying {U}.
6. Repeat.

What the combo produces

• Infinite creature LTB
• Infinite death triggers
• Infinite draw triggers
• Infinite ETB
• Infinite sacrifice triggers
• Infinite storm count