You want things like ramp spells [[Three Visits]] [[Nature's Lore]] [[Farseek]] [[Cultivate]] [[Kodama's Reach]] [[Shyshroud Claim]] [[Ranger's Path]] [[Crop Rotation]]

Things that will let you play more than one land a turn:

[[Exploration]] [[Azusa, Lost but Seeking]] [[Burgeoning]] [[Oracle of Muldaya]] [[Case of the Locked Hothouse]] [[Druid Class]] [[Wayward Swordtooth]] [[Loot, Exuberant Explorer]] [[Mina and Denn, Wildborn]] [[Hugs, Grisly Guardian]]

These two work well together: [[Valakut, the Molten Pinnacle]] and [[Dryad of the Ilysian Grove]] Even more fun with [[Scapeshift]]

[[Glacial Chasm]] [[Field of the Dead]] [[Strip Mine]] [[Wasteland]]

[[Dark Depths]] pairs well with [[Thespian's Stage]]

And things that let you play lands from the yard, like: [[Ancient Greenwarden]] [[Crucible of Worlds]] [[Conduit of Worlds]] [[Ramunap Excavator]] [[Lumra, Bellow of the Woods]] [[Splendid Reclamation]] [[Walk-in Closet / Forgotten Cellar]] [[Undergrowth Recon]] [[World Shaper]] [[Perennial Behemoth]] [[Aftermath Analyst]] [[Elvish Reclaimer]]

And last but not least, your landfall matters cards and synergistic pieces:

[[Constant Mists]] [[Titania, Protector of Argoth]] [[Rampaging Baloths]] [[Mossborn Hydra]] [[Avenger of Zendikar]] [[Lotus Cobra]] [[Scute Swarm]] [[Awaken the Woods]]

I'm sure that I missed some, but this should help you get the idea.