Infested Thrinax + Nim Deathmantle + Phyrexian Altar

Infested Thrinax

Nim Deathmantle

Phyrexian Altar

How it works

1. Cast Infested Thrinax by paying 3.
2. When Infested Thrinax enters the battlefield, it triggers, causing you to create a number of 1/1 Saproling creature tokens when a nontoken creature you control dies.
3. Activate Phyrexian Altar by sacrificing Infested Thrinax, adding 1.
4. When Infested Thrinax dies, it triggers for each time it entered the battlefield this turn, and Nim Deathmantle triggers.
5. Resolve all Infested Thrinax triggers, creating a number of 1/1 Saproling creature tokens equal to its power for each trigger.
6. Holding priority, activate Phyrexian Altar three times by sacrificing three Saprolings, adding 3.
7. Resolve the Nim Deathmantle trigger, causing you to pay 4 to return Infested Thrinax from your graveyard to the battlefield, and attach Nim Deathmantle to it.
8. Repeat from step 2.