I'm sure many of you saw that the land 1.5 white paper is out as of today. https://splinterlands.gitbook.io/the-secret-of-praetoria/
I'll make this post quick because these card prices are already going up fast.
I made a spreadsheet to calculate the most efficient cards to buy for land. Prices are calculated based on maxed level cards. I found the regular Rare cards (mainly CL rewards cards) to be most efficient with a price of $0.00523 per PP at a current cost of $.05 per bcx.
I hope this is helpful. Highlighted in green are some cards I'm targeting. Ready set go!