Endless Cockroaches + Pitiless Plunderer + Phyrexian Altar + Jet Medallion

Endless Cockroaches

Pitiless Plunderer

Phyrexian Altar

Jet Medallion

How it works

1. Activate Phyrexian Altar by sacrificing Endless Cockroaches, adding .
2. Endless Cockroaches dies, triggering itself and Pitiless Plunderer.
3. Resolve the Endless Cockroaches trigger, returning it from your graveyard to your hand.
4. Resolve the Pitiless Plunderer trigger, creating a Treasure token.
5. Activate the Treasure by tapping and sacrificing it, adding .
6. Cast Endless Cockroaches by paying .
7. Repeat.