Some color combinations simply dont have any mana ramp worth playing at all, either forcing you to consider extremely mediocre options or exclusively rely on single color cards and mana rocks to get the job done: Dimir (Blue/Black) Boros (Red/White) Orzhov (Black/White) Esper (Black/Blue/White) Grixis (Blue/Black/Red) Abzan (Green/Black/White) Sultai (Black/Green/Blue) Temur (Green/Blue/Red) Most 4-color groupings That doesnt mean all other color combinations have amazing ramp options though many can only offer situationally powerful cards
Charismatic Conqueror Whites disruptive creatures are among its best features
Tutors: Transmute Artifact, Gamble, Mystical Tutor, Personal Tutor Ramp: Mana Crypt, Solemn Simulacrum, Thran Dynamo, Gilded Lotus, Mana Vault, Grim Monolith, Basalt Monolith, Voltaic Key, Coalition Relic Disruption: Force of Will, Mana Drain, Counterflux, Vandalblast, Blasphemous Act, Pongify, Rapid Hybridization, Cyclonic Rift Draw: Rhystic Study, Recurring Insight, Consecrated Sphinx Utility: Lightning Greaves, Ral Zarek, Time Stretch, Dack Fayden, Sensei's Divining Top Lands: Academy Ruins, Strip Mine, [Reliquary Tower]], Command Tower, Sulfur Falls, Steam Vents, Shivan Reef, Desolate Lighthouse, Cascade Bluffs, Scalding Tarn, Volcanic Island, Minamo, School at Water's Edge, Ancient Tomb, Myriad Landscape If you're mad enough to fully bling out a Coin Flip deck, then here's a list for you to ponder: Next One's A Secret
Often regarded for powerful strategies ranging from control to mill, Dimir (blue/black) is one of the most iconic color identities in Magic: The Gathering