Gloriosa (Grandma Nyon) 7-cost isnt a popular inclusion in Nami decks, but if you have him and want to add him to the list, he can lower the cost of your Blue Event by 1, making it easier for you to play them on future turns
I've discovered 120+ Mythics that fit this basic budget criteria
You get to draw all gas, and still have the mana to cast said gas, all while gaining a little bit of life which is relevant in a lot of matchups
Not only is it solid against aggro decks and tokens, but its got a lot of game against cards like Growth-Chamber Guardian, Hydroid Krasis, Hero of Precinct One, Runaway Steam-Kin, and more
The other Booster Fun variants are inserted at slightly higher rates than listed below to make up the difference
With Rakdos having so many powerful vampires, you also get tons of payoff cards for those strategies