Make sure to place a Riolu in the active spot if you have one
If you really wanted to cover all the bases, you could add 9 more cards that, according to my research, are rarely but occasionally played competitively these days: Arrogant Wurm, Beetleback Chief, Bottle Gnomes, Fyndhorn Elves, Order of Leitbur, Order of the Ebon Hand, Portent, Shield Sphere, and Whispers of the Muse
These are obviously some of the best and more desired reprints in the set, but it would be really boring if we just put a bunch of these in our top 10 and there wouldnt be room for much else
Its also very exciting to think about what you can do with this sort of mana acceleration and how the symmetrical nature of the card impacts games
These cards are all the same group because they all share the exact same list of threat and support cards that make them good