The Seed called saffron has a massive mountain with a huge cave, This seed also includes large amounts on iron and gold and diamond.  This map supplies all of the types of trees. Very large snow biome, lots of ice, waterfall, Snowy area is nice and flat.


This seed does not have much lapis lazuli or sugar cane but you can get loads of sugar cane from the Nether Reactor.


All in all, this is an amazing seed, you should get it for a relatively challenging survival.