Leyline of Singularity + Phyrexian Altar + Ratadrabik of Urborg

WUB identity

Commander legal

The 3 combo pieces

• Leyline of Singularity
• Phyrexian Altar
• Ratadrabik of Urborg

How to execute it

1. Activate Phyrexian Altar by sacrificing any other creature you control, adding one mana of any color.
2. When the creature dies, Ratadrabik triggers, creating a token copy of the creature that is a 2/2 legendary Zombie in addition to its other types.
3. Repeat.

What the combo produces

• Infinite colored mana
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers