In 1994, when Wizards of the Coast decided to create sanctioned tournament play, the Power 9 were restricted in the very first Banned & Restricted announcement
Crop Rotation, Deadly Rollick, Culling the Weak, Diabolic Intent, Phyrexian Altar, Ashnod's Altar, and Phyrexian Tower all play a big role in how the deck takes shape, creating several loops where creatures are sacrificed for benefits like infinite ETBs, death triggers, mana, and so on
[2] You can target 1 face-up card your opponent controls and 1 Level 8 or higher DARK Pyro monster in your GY
But where Exhume can lead to some nasty blowouts or fall off quickly after the first few turns, Stitch Together offers the most natural condition most graveyard decks could hope for: you just have to load up your yard a little, and away you go
It That Heralds the End It That Heralds the End has tons of potential, if you can manage the wonky mana cost
The Alpha Black Lotus takes its rightful place on the throne of the most expensive cards in 2020