Nice work on getting yourself in a passive income situation ! , this truly is the amazing part of Splinterlands.

Thanks for the link to the RoI tool, I didn't know about that one, looks like it will be useful.

For what it's worth, I'd combine the LP's and buying targeted cards to rent, packs are a gamble and your best outcome on average will be two rares in a pack. I think targeted buying will be the better option.

As for the LPs, Grain is definitely a good long term move. Why not hedge your bets and put some into each pool ?, I think all resources will be in demand and I can see a time when there are a few more demands for resources. Already we have gone from Grain to feed workers ( and that's not going away), to a basket of resources needed for Research, SPS and now Aura. The repair of rebellion wagons will add more demand ( Wood heavy maybe ?), and I am sure Cryptomancer is in full flow, each development seems to be adding demand for resources.

And cards !, they will be your backbone for years to come, Rebellion is looking like it might be a relatively scarce set. I wonder what your return on an unopened Rebellion pack might be in a few months if you can grab a bargain on the market. I see some for 4,450 DEC atm, 10% to 20% in a month or two may not be too far a stretch. I can see pack liquidity drying up as packs may be taken off the market and staked on wagons for airdrops