Battalion Foot Soldier + Phyrexian Altar + Mortuary + Urza's Incubator

Battalion Foot Soldier

Phyrexian Altar

Mortuary

Urza's Incubator

How it works

1. Cast Battalion Foot Soldier by paying .
2. When Battalion Foot Soldier enters the battlefield, it triggers.
3. Holding priority, activate Phyrexian Altar by sacrificing Battalion Foot Soldier, adding .
4. When Battalion Foot Soldier dies, Mortuary triggers, putting Battalion Foot Soldier on top of your library from your graveyard.
5. Resolve the Battalion Foot Soldier trigger from step 2, searching your library for Battalion Foot Soldier and putting it into your hand.
6. Repeat.