Maybe some land destruction like Blood Moon or Alpine Moon is in order
Boreas Charger Boreas Charger is a game-changer, capable of bringing multiple lands directly into play
Wall of Hope and Perimeter Captain do this a bit as well but they are in a secondary colour and can be more easily played around
These prices can change over time and due to events (such as reprints)
Having a quick way to tap Kona, Rescue Beastie or Kilo, Apogee Mind is always handy (and, in the latter's case, can then proliferate those charge counters for even more profit), even if you're not expecting to make use of a station card's abilities
(For you newcomers, the reason you dont see one in my Paris list is due to the fact that this card didnt exist back then.) To finish this skeleton, we need the rest of the blue cards