Battalion Foot Soldier + Phyrexian Altar + Mortuary + Heartless Summoning

Battalion Foot Soldier

Phyrexian Altar

Mortuary

Heartless Summoning

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.

This ingenious loop relies on Heartless Summoning to reduce the cost of your creatures, allowing you to cast Battalion Foot Soldier for free using the mana generated by sacrificing it to Phyrexian Altar. Whenever the Foot Soldier hits the graveyard, Mortuary instantly places it right back on top of your library so its enter-the-battlefield ability can tutor another copy straight to your hand. Because Heartless Summoning also applies a permanent -1/-1 penalty to your creatures, the Battalion Foot Soldier's 1/1 toughness is reduced to 0 right as it enters, ensuring it automatically goes to the graveyard without even needing to wait for lethal damage.