Nevinyrral, Urborg Tyrant + Phyrexian Altar + Nim Deathmantle

Nevinyrral, Urborg Tyrant

Phyrexian Altar

Nim Deathmantle

How it works

1. Activate Phyrexian Altar by sacrificing Nevinyrral, adding 1.
2. When Nevinyrral dies, its second ability and Nim Deathmantle trigger.
3. Resolve the Nevinyrral trigger, choosing not to pay.
4. Resolve the Nim Deathmantle trigger, causing you to pay 4 to return Nevinyrral to the battlefield from your graveyard, and attach Nim Deathmantle to it.
5. When Nevinyrral enters the battlefield, its first ability triggers, creating a tapped 2/2 Zombie creature token for each creature that has died this turn.
6. Activate Phyrexian Altar three times by sacrificing three Zombie tokens, adding 3.
7. Repeat.