Nevinyrral, Urborg Tyrant + Phyrexian Altar

Nevinyrral, Urborg Tyrant

Phyrexian Altar

How it works

1. Cast Nevinyrral by paying 3 plus commander tax.
2. Nevinyrral enters the battlefield.
3. In response, activate Phyrexian Altar by sacrificing Nevinyrral, adding 1.
4. Decline to pay for Nevinyrral's leave the battlefield trigger.
5. Resolve Nevinyrral's ETB trigger, creating a tapped 2/2 Zombie creature token for each creature that died this turn.
6. Activate Phyrexian Altar by sacrificing all Zombie tokens, adding 1 for each.
7. Repeat.