Dreams of the Dead + Phyrexian Altar + Priest of Gix + Void Maw

UB identity

Commander legal

The 4 combo pieces

• Dreams of the Dead
• Phyrexian Altar
• Priest of Gix
• Void Maw

How to execute it

1. Activate Phyrexian Altar by sacrificing Priest of Gix, adding {U} and exiling it to Void Maw.
2. Activate Void Maw by returning Priest of Gix to your graveyard, giving Void Maw +2/+2 until end of turn.
3. Activate Dreams of the Dead for {1}{U}, returning Priest of Gix from your graveyard to the battlefield.
4. When Priest of Gix ETBs, add {B}{B}{B}.
5. Repeat.

What the combo produces

• Infinite black mana
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers
• Infinitely large creature until end of turn