Genestealer Patriarch + Phyrexian Altar + Fate Transfer + Host of the Hereafter

Genestealer Patriarch

Phyrexian Altar

Fate Transfer

Host of the Hereafter

How it works

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. Cast Fate Transfer by paying its cost, moving the infection counter from the opponent's creature onto a creature you control.
4. Activate Phyrexian Altar by sacrificing the creature with an infection counter on it, adding one mana.
5. When the creature dies, Host of the Hereafter and Genestealer Patriarch's second ability trigger.
6. Resolve the Host of the Hereafter 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. Repeat from step 4.