This is not just about making a fun cube or even about just making good decks that won't screw you very often
Eldrazi Monument If you run a lot of the best colorless creatures MTG or powerful artifact creatures, the Eldrazi Monument makes them even more of a headache for your opponents to deal with
Ramirez Depietro, Pillager is likewise a homerun design itll slot into Grixis Pirates but can quite happily lead a deck on its own
This plays well with self-exiling like gathering evidence in this set or Night Soil, or Regrowth/Raise Dead to your hand, or shuffle in like Feldon's Cane or reanimation like Zombify
Sengir Vampire was not printed in Fifth, but seemed to be replaced by Fallen Angel, which had been a Legends reprint in Chronicles
If you have Muk or Wheezing in your Active Spot in a match, you can play the Koga Trainer card