Saw in Half + Sacrifice + Warden of the Eye

Saw in Half

Sacrifice

Warden of the Eye

How it works

1. Cast Saw in Half by paying 2, destroying Warden of the Eye and creating two token copies of it with base power equal to half the destroyed creature's power and base toughness equal to half the destroyed creature's toughness, rounding up each time.
2. When the Warden of the Eye tokens enter the battlefield, they trigger, returning Saw in Half and Sacrifice from your graveyard to your hand.
3. Cast Sacrifice by paying and sacrificing a Warden of the Eye token, adding an amount of equal to its mana value.
4. Repeat.

This loop relies on the brilliant recursion engine of Warden of the Eye, which enters the battlefield to fetch back your spells and keeps the chain alive. You kick things off with Saw in Half to blow up the original Warden and duplicate it into two token copies, whose entry triggers scoop both Saw in Half and Sacrifice right back out of your graveyard. From there, you use Sacrifice to turn one of those tokens into a burst of black mana, fueling the next iteration of Saw in Half to repeat the process indefinitely.