>>96402440
I like Horizon Explorer, because of the way he is worded. Potentially can get you 3x rampant growth's tokens each attack step, and since the lands fetched enters' untapped via the passive ability, it effectively only cost you (1) to fetch up basics.
It can ramp you up pretty damn fast if you get to throw away some chumpers during attack steps. May not become a mandatory staple for land matter.deck, but that will be a solid inclusion nonetheless. Especially if you already run a bunch of enters tapped lands.