Sigil of the New Dawn + Pawn of Ulamog + Phyrexian Altar + Memnite

Sigil of the New Dawn

Pawn of Ulamog

Phyrexian Altar

Memnite

How it works

1. Activate Phyrexian Altar by sacrificing Memnite, adding .
2. Pawn of Ulamog and Sigil of the New Dawn trigger.
3. Resolve the Pawn of Ulamog trigger, creating a 0/1 Eldrazi Spawn creature token.
4. Activate the Eldrazi Spawn by sacrificing it, adding C.
5. Resolve the Sigil of the New Dawn trigger, causing you to pay 1 to return Memnite from your graveyard to your hand.
6. Cast Memnite by paying 0.
7. Repeat.