Mortuary + Walking Ballista + High-Society Hunter

Mortuary

Walking Ballista

High-Society Hunter

How it works

1. Cast Walking Ballista by paying 0.
2. Walking Ballista enters and dies as a state-based action due to having 0 toughness, triggering Mortuary and High-Society Hunter.
3. Resolve the Mortuary trigger, putting Walking Ballista from your graveyard onto the top of your library.
4. Resolve the High-Society Hunter trigger, causing you to draw a card, thus drawing Walking Ballista from your library.
5. Repeat.

This loop turns the zero-mana casting of Walking Ballista into a self-sustaining engine of perpetual motion. As Walking Ballista hits the battlefield with zero toughness and instantly perishes, Mortuary steps in to cleanly rescue it from the graveyard straight to the top of your library. Meanwhile, High-Society Hunter watches this tiny construct perish and rewards you by letting you draw a card, naturally drawing Walking Ballista right back into your hand to begin anew.