Traits of Good Multicolor Mana Ramp Cards Playable mana ramp in Commander almost always needs to have at least 2 of the following traits to justify its inclusion in a deck: Low mana cost (ideally 4 or less, lower usually being better) A permanent impact on your board A sizable mana ramp or acceleration payoff Most multicolor ramp spells simply fall short of their monocolor brethren under these criteria for a couple reasons
Honorable Mention - Sliver Overlord, Sliver Hivelord, Sliver Queen, Sliver Legion Because they are the one tribal deck that plays so similarly, has the same slate of Slivers each time, and very similar support for them, I find this combo to be very boring, pervasive, and more
Memorial Vault fixes Red's card advantage woes in style
Adeline, Resplendent Cathar Adeline, Resplendent Cathar was quite the respectable 3-drop in Standard
Unlicensed Disintegration is an Instant-speed spell with a casting cost of one generic, one Black, and one Red mana
The deck is also quite resilient, as you can find plenty of cards that utilize your high-powered creatures, like Greater Good and Rite of Consumption, saving you from total reliance on your Golgari commander