Mortuary + Garruk's Horde + Ugin's Conjurant

Mortuary

Garruk's Horde

Ugin's Conjurant

How it works

1. Cast Ugin's Conjurant either from your hand or from the top of your library by paying 0.
2. Ugin's Conjurant enters the battlefield and dies as a state-based action due to having zero toughness.
3. Mortuary triggers, putting Ugin's Conjurant on top of your library from your graveyard.
4. Repeat.

This elegant little loop turns a fragile elemental into an endlessly recurring topdeck engine, exploiting Ugin's Conjurant entering with zero toughness when cast for free as X equals zero. Because Garruk's Horde lets you play creature spells right from the top of your library and reveals your library's top card to keep the momentum going, you can continuously cast the same threat over and over. As soon as Ugin's Conjurant hits the graveyard, Mortuary intercepts it to place the card straight back onto your library, perfectly setting up Garruk's Horde to cast it again.