You can choose which side you want to play when you cast it, and this 'unlocks' that door
Set the lowest grade you'll accept across five grades: NM, LP, MP, HP, DMG
Pitiless Plunderer isnt exactly a paragon of efficiency, but if you are specifically looking to sacrifice a lot of creatures and a lot of artifacts, it has a niche
With a haste enabler, like Lightning Greaves, and a way to untap creatures or generate mana on death, like Pitiless Plunderer, you can create an infinite loop of Joo Dees, filling your graveyard with the Surveil trigger
What if Unglued was thata set filled with lots of weird and different things the players could do with as they wished