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
The best part about cube is the sheer variety of cards that you get to play
the ten best Yetis that Magic has to offer
The most powerful mana rocks are here, along with the last remaining two dual land fetchers Nature's Lore and Skyshroud Claim, which will only get better as we add more Forest duals
Red has access to some of the flashiest effects in Commander, and also some of the ones with the highest variance
Combined with free burn damage from Creeping Chill, this is generally enough to end games quickly