Serrated Biskelion + Thornbite Staff + Thran Vigil + Phyrexian Altar + Evernight Shade

Serrated Biskelion

Thornbite Staff

Thran Vigil

Phyrexian Altar

Evernight Shade

How it works

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