(There is psychological value to countering an opposing spell with a Force Spike since they are so easy to play around, yet it's not worth playing around them in Commander because they aren't heavily played, which makes getting your powerful spell hit by Jwari Disruption especially devastating.) As for the rest of the bunch, Silundi Vision is listed as an often play just because you need to be a reasonably spell-heavy deck for it to work

Dark Ritual effects one-shot bursts like Dark Ritual, Cabal Ritual, and Songs of the Damned for explosive early plays Swamp-scaling engines Cabal Coffers, Crypt Ghast, and Nirkana Revenant multiply mana based on your Swamp count Life-to-mana conversion K'rrik, Son of Yawgmoth and Bolas's Citadel let you spend life instead of mana Sacrifice-based mana Phyrexian Altar and Ashnod's Altar convert creatures into mana for combo turns Treasure generation Revel in Riches, Black Market Connections, and Pitiless Plunderer produce Treasures tied to death triggers Building a Black Ramp Package Mono-black ramp packages should be built around the Coffers engine: Cabal Coffers, Urborg, and 2-3 Swamp-scaling payoffs like Crypt Ghast and Magus of the Coffers
But I love dork flashers you can bring back and then trigger and recast like this six-cost flying duo or, say, Mystic Snake
For color adjusting, we made spells that had two different costs, each one in a different color