We must settle this once and for all boyz, sylvan scrying, tolaria west or expedition map?
+ cost only 2
+ can be fetched with Peer Through Depths
+ can up the storm count, becoming a very expensive cantrip tutoring up sanbar (extremely fringe use, shouldn't happen)
- force you to play a third color just for the card
- force to have a high density of G producing lands to enable it T2 as much as possible
+ cost 3 but can be paid on 2 turns
- can be destroyed before being cracked
- sensible to needle effects and stony effect
+ is a land, the more the better since it's imperative to not miss any land drop early on
+ can't be discarded
+ can't be countered
+ can tutor up evermind and various stuff from sb (like EE or pact of negation)
+ can't be named by meddling mage
- cost 3
To me tolaria sound like the best option considering how the card basically say fuck to every kind of hate, and that's pretty important when it's about fetching the cornerstone card of the deck. But beside the hate-proof, it's also good to be able to simply use it as a bad island if you open a land-light hand, where map or scrying wouldn't do anything. Imho the one extra mana is worth the hassle.