Ashnod's Altar + Pitiless Plunderer + Reassembling Skeleton - COMBO

Actual set may vary

Steps

1. Activate Ashnod's Altar by sacrificing Reassembling Skeleton, adding 
2. When Reassembling Skeleton dies, Pitiless Plunderer triggers, creating a Treasure artifact token
3. Activate the Treasure by tapping and sacrificing it, adding 
4. Activate Reassembling Skeleton by paying , returning it from your graveyard to the battlefield
5. Repeat
7. Actual set may vary