Serrated Biskelion + Thornbite Staff + Thran Vigil + Phyrexian Altar + Butcher Ghoul

Serrated Biskelion

Thornbite Staff

Thran Vigil

Phyrexian Altar

Butcher Ghoul

How it works

1. Activate Serrated Biskelion by tapping it, putting a -1/-1 counter on it and Butcher Ghoul.
2. Activate Phyrexian Altar by sacrificing Butcher Ghoul, adding one mana of any color.
3. When Butcher Ghoul dies, its undying ability and Serrated Biskelion trigger.
4. Resolve the Serrated Biskelion trigger, untapping it.
5. Resolve the Butcher Ghoul trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6. When Butcher Ghoul leaves your graveyard, Thran Vigil triggers, putting a +1/+1 counter on Serrated Biskelion.
7. Repeat.