Void Attendant + Planar Void + Phyrexian Altar + Zirda, the Dawnwaker

Void Attendant

Planar Void

Phyrexian Altar

Zirda, the Dawnwaker

How it works

1. Activate Void Attendant by paying and putting a card an opponent owns from exile into their graveyard.
2. Planar Void triggers, exiling the card put into the graveyard.
3. Resolve the Void Attendant ability, creating a 1/1 Eldrazi Scion creature token.
4. Activate Phyrexian Altar by sacrificing the Eldrazi Scion, adding .
5. Repeat.