Though you could also play Master Duel on PC with BlueStacks and run multiple instances, which will easily let you keep multiple decks without the money or time investment The main methods of obtaining gems for free are by completing missions, both limited and unlimited, as well as through rewards from completing solo chapters
I agree that its something that could truly benefit from being documented thoroughly, and youd be doing the community a huge service
We use Fantasy Flight Greens (FFSo3) Standard American Board Game Sleeves to sleeve our Wingspan Cards
Trace the curved design on the front/back, side and center pieces
On its own, mono-blue can get you creatures with combat damage triggers that draw cards (Neurok Commando, Tandem Lookout, Scroll Thief) and ninjas with ninjutsu and other combat damage triggers (Mistblade Shinobi, Mist-Syndicate Naga)
Untapping Lattice-Blade Mantis as its last ability resolves doesn't remove it from combat