Genestealer Patriarch, Leech Bonder, Yahenni, Undying Partisan, and Reyhan, Last of the Abzan

Prerequisites

• Genestealer Patriarch on the battlefield
• Leech Bonder on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Reyhan, Last of the Abzan on the battlefield
• available

Steps

1. Declare Genestealer Patriarch as an attacker
2. Genestealer Patriarch's first ability triggers, putting an infection counter on a creature an opponent controls
3. Activate Leech Bonder's ability by paying its cost, moving the infection counter from the opponent's creature onto a creature you control
4. Activate Yahenni by sacrificing the creature with an infection counter on it
5. When the creature dies, Reyhan and Genestealer Patriarch's second ability trigger
6. Resolve the Reyhan trigger, putting an infection counter onto another creature you control
7. Resolve the Genestealer Patriarch trigger, causing you to create a token copy of the sacrificed creature that is a Tyranid in addition to its other types
8. Resolve the Yahenni ability
9. Repeat from step 4

Results

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