This can be used as an effective damage spell with the potential to hit multiple targets
Banlist History Restriction changes recorded for Metalfoes Mithrilium
These lands are mighty for a few reasons, but the most important one is that you can sort out a lot of mana issues because they all have two basic land types - which means you can fetch them up with a lot of different ramp spells, and even fetch lands too
The Safest card to spoils for will obviously be another Cabal Ritual
Absolute King Back Jack is phenomenal for the deck, as it can help toolbox Trap cards, stack draws in your favor, and get you multiple Paleozoic summons in combination with Fiend Griefing
Mew ex can be a worthy addition to this deck as mentioned, but if you dont have it, a solo Mewtwo ex deck still works wonders