Catalyst Elemental + Leyline of Singularity + Ratadrabik of Urborg

WUBR identity

Commander legal

The 3 combo pieces

• Catalyst Elemental
• Leyline of Singularity
• Ratadrabik of Urborg

How to execute it

1. Activate Catalyst Elemental by sacrificing it.
2. When Catalyst Elemental dies, Ratadrabik triggers, creating a token copy of Catalyst Elemental that is a 2/2 legendary Zombie in addition to its other types.
3. Repeat using the Catalyst Elemental token

What the combo produces

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