Leyline of Transformation + Xathrid Necromancer + Yahenni, Undying Partisan

UB identity

Commander legal

The 3 combo pieces

• Leyline of Transformation
• Xathrid Necromancer
• Yahenni, Undying Partisan

How to execute it

1. Activate Yahenni by sacrificing any other creature.
2. When the creature dies as a Human due to Leyline of Transformation, Xathrid Necromancer triggers, creating a 2/2 Zombie creature token.
3. Resolve the Yahenni ability.
4. Repeat.

What the combo produces

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