This is due to Frogmite's single ability: affinity for artifacts, which means that Frogmite's mana cost is reduced by one for each artifact you control
You never want to choose more than three colours (at least, most of the time) and if you want to be safe then having two is probably the best way
As you can see pictured above, there are 7 individual treatments for these ultra powerful crystalline icons: Red, Blue, Light Blue, Green, Purple, and Clear
There are occasional irritating, unpredictable moments of lag, typically when youre trying to play a card that affects both players or multiple other cards, but it doesnt detract from the overall experience
Weve seen plenty of these in the common slot for Limited over the years
Though Nefeltari Vivi also known as the slightly different Nefertari Vivi, depending on the translation from the Japanese text debuted long before the arcs featured in Kingdoms of Intrigue, she joined the Straw Hat Pirates during the Arabasta arc