The term "ramp" in Magic: The Gathering refers to any spell card that generates a net positive amount of mana, whether that be through floating mana that expires at the end of the phase, lands placed onto your side of the field (though some count searching up lands to put into your hand as ramp as well), or artifacts and cards that create artifacts that can tap for mana
Frank Karstens build, which he piloted to a Top 16 finish in Costa Rica, relies heavily on Jaces Sanctum: Lands (24) 20 Island 4 Sunken Hollow Spells (36) Jaces Sanctum is really great in this deck but opens up a vulnerability to Dromokas Command
The Bad Setzer, Wandering Gambler cares about Vehicles and coin flips which is completely unsupported in this deck
Exotic Orchard will help you get to the five colors you need more often than not, and is far less expensive than some lands on this list
Case in point - HeiHei, Boat Snack