My advice would be to wait another week or two for supply to increase as players start cracking their prerelease kits and packs, and then snag the singles you need
Note it's legendary so you can only make one Octopus, attack and then make one untapped to replace it
First and foremost, as treasures produce mana of any color, this provides a deck with great mana fixing
I count: 38 lands and Gyre Sage, Incubation Druid, Fertilid, Rishkar, Peema Renegade, Wood Elves, Cultivate, Kodama's Reach, Sol Ring, Arcane Signet, Fractured Powerstone, Commander's Sphere, Ichor Elixir 50 mana
Once you understand the parts of the card and the gameplay basics, you can quickly jump into your first quest