Nim Deathmantle + Phyrexian Altar + Somberwald Beastmaster

Nim Deathmantle

Phyrexian Altar

Somberwald Beastmaster

How it works

1. Activate Phyrexian Altar by sacrificing Somberwald Beastmaster, adding 1.
2. Somberwald Beastmaster dies, triggering Nim Deathmantle, causing you to pay 4 to return Somberwald Beastmaster from your graveyard to the battlefield, and attach Nim Deathmantle to it.
3. Somberwald Beastmaster enters the battlefield, creating a 2/2 Wolf, a 3/3 Beast and a 4/4 Beast creature token.
4. Activate Phyrexian Altar three times by sacrificing the Wolf and two Beasts, adding 3.
5. Repeat.