The mana investment was high, but you were essentially getting an army in a can
Again, these are widely-played cards, with the nonland ones seeing play in over 800,000 Commander decks combined according to EDHREC, but the total value here is barely $6.60
Namely, that this lets you counter a spell outright, and then gives you a resource to use on something
We're slowly but surely seeing a shift in precons adding more and more untapped duals: we've got filter lands like Cascade Bluffs, some reveal lands like Choked Estuary which while not amazing are still better than any tapped dual, and battlelands like Sunken Hollow
Its a great way to immediately bring yourself up to speed and Amber & Emerald does so in a way thats slightly friendlier than the other Into the Inklands starter deck
Sorcery Color tag templates(None) Reach the Horizon Search your library for up to two basic land cards and/or Town cards with different names, put them onto the battlefield tapped, then shuffle