As for artifacts,
Treasure Map and
Thaumatic Compass do great work for scrying through your deck and getting the right mana fixing, if not necessarily ramping you very early. Creature-wise,
Wood Elves Puts a
forest directly onto the battlefield with the potential to re-cast it later with
The Mending of Dominaria.
Yavimaya Elder doesn't ramp, but it lets you fix your mana. It searches specifically for basics though, so make sure you're watching your basic count, especially later game.
Stone-Seeder Hierophant is also a good ramp option, again working very well with every land
entering the battlefield causing it to trigger one at a time, you could mega ramp with something like
Grow From The Ashes putting two lands onto the battlefield, suddenly you have 4 floating mana. Hope this helps!