A good approach is to lay out the whole deck, think through what you'd cut and side in against which deck, and hence prepare your own sideboard guide
With dual, sac and shock lands taking the first spots in most decks mana bases the Check Lands are still good with one or zero basics in a three land deck
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The second is much closer
This box contains Blastoise, Venusaur, Mewtwo, and the elusive Charizard
Diamond Valley is a little-mentioned member of the Reserved List, with just one printing back in 1993, and both its age and its obscurity make sales infrequent