Discover can be thought of as a variant of Cascade, but where Cascade was linked to the cards mana value and triggered when the card was cast, Discover will be written with a number next to it and can be triggered in multiple ways
I would then use Den Protector to return Liliana to my hand, and the two cards would just continue to cycle back and forth while I would hit more land drops and fill my graveyard with Deathmist Raptors
Chromium ( F ) - Expensive and hard to cast, with an upkeep cost
If you feel like I left off a must-play zombie, or valued something too high, let me know in the comments below or over in the Draftsim Discord
FCA cards also have their own set symbol: Many of the illustrations are from /YOSHITAKA AMANO who was the main character, image, and graphic designer from Final Fantasy I to Final Fantasy VI and from /TETSUYA NOMURA, who took up Amano's mantle from Final Fantasy VII onward
Note that this is an enters-the-battlefield and not a cast trigger