cheap evolutions booster box Mega Evolution - with Topper (EN) Mega Evolution booster packs and 1 bonus illustration rare Pokémon Prismatic Evolutions Booster Pack

It lets you add X mana of any one color, where X is Mona Lisa's power

Rumors of a land beyond the horizon, where palaces glisten with gold, fountains overflow with milk and honey, the air is rich with the scent of exotic nectar, and indescribable colors dance gracefully on the gentle breeze within this world of unimaginable luxury

Then, finally tap your mountain to Fireball, X = 20, with your (19) and the spare (G) from Black Lotus

Specific deck archetypes may use more or less of each card type, but everything has to balance out to 60 in the end

Read as written this is a bit wonky, but mostly this is just a leftover from the days before the command zone existed