Mortuary + Phyrexian Marauder + Gwenom, Remorseless

Mortuary

Phyrexian Marauder

Gwenom, Remorseless

How it works

1. Cast Phyrexian Marauder either from your hand by paying 0 or from the top of your library by paying 0 life.
2. Phyrexian Marauder enters and dies as a state-based action due to having 0 toughness.
3. Mortuary triggers, putting Phyrexian Marauder from your graveyard onto the top of your library.
4. Repeat.

This clever loop turns the zero-cost metal of Phyrexian Marauder into an endless engine of sacrifice and rebirth. Because Phyrexian Marauder enters the battlefield with zero toughness by default, it immediately perishes as a state-based action, reliably triggering Mortuary to whisk it straight from your graveyard back to the top of your library. From there, Gwenom, Remorseless bridges the gap by letting you play cards directly from the top of your library; whenever you cast that tiny construct, Gwenom's alternative life-payment cost replaces its mana value with zero, requiring zero actual mana to keep the entire cycle spinning.