Golgari Thug + Phyrexian Altar + Garruk's Horde + Pitiless Plunderer

Golgari Thug

Phyrexian Altar

Garruk's Horde

Pitiless Plunderer

How it works

1. Activate Phyrexian Altar by sacrificing Golgari Thug, adding .
2. Golgari Thug dies, triggering itself and Pitiless Plunderer.
3. Resolve the Golgari Thug trigger, putting itself from your graveyard on top of your library.
4. Resolve the Pitiless Plunderer trigger, creating a Treasure token.
5. Activate the Treasure token by tapping and sacrificing it, adding 1.
6. Cast Golgari Thug from the top of your library by paying 1.
7. Repeat.