If you have a shared creature type in your deck, or even just one singular threat you really must resolve, you need to be rostering four Cavern of Souls ASAP
For best results in tuning a list, a combination of a checklist, playtesting, probability math, and (most importantly!) playing cards you that find enjoyable is the way to go
This allows you to play out your turn without having to worry about someone trying to interact with you with removal or counterspells
While Im not the handiest of gentlemen, there are definitely some of you out there who are
While FoF cannot compete well with Dig Through Time it remains one of the most powerful and splashable straight card advantage spells ever printed
Value Cards: Nahiri, the Lithomancer Grand Abolisher Angelic Field Marshal Comeuppance Skullclamp Pearl Medallion Cathars Crusade True Conviction Arcane Lighthouse Emeria, the Sky Ruin Brave the Elements The mono-white deck has 11 total valuable cards, weighing in at around $135