Saw in Half + Burnt Offering + Mnemonic Wall

Saw in Half

Burnt Offering

Mnemonic Wall

How it works

1. Cast Saw in Half by paying 2, destroying Mnemonic Wall 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 Mnemonic Wall tokens enter the battlefield, they trigger, returning Saw in Half and Burnt Offering from your graveyard to your hand.
3. Cast Burnt Offering by paying and sacrificing a Mnemonic Wall token, adding plus an additional amount of and/or equal to its mana value minus 2.
4. Repeat.

This loop is a masterclass in recursive recycling, using Saw in Half to split a single Mnemonic Wall into two copies that immediately trigger upon entry to fish both Saw in Half and Burnt Offering right back out of your graveyard. Once you have your pair of walls, you can feed one of them to Burnt Offering to easily generate the black and red mana needed to recast Saw in Half on the remaining wall. Because the resulting tokens enter the battlefield to restock your hand while leaving you ahead on mana with every single iteration, you can repeat the process indefinitely for infinite sacrifices, deaths, and mana of any color combination you desire.