Powerstones have limited use, but you can usually find a mana sink to filter the mana through, if not just use them as fodder for some artifact sacrifice engine
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I also manage to pull two of the Cosmic Holo energies the Japanese set had the Great Ball reverse holo pattern on one card per Booster Box, but we are getting the still-nice-but-not-Great-Ball Cosmic Holo pattern energy in greater frequency
When Lotuslight Dancers enters the battlefield, you get to search your library for a black card, a green card, and a blue cardand toss them straight into your graveyard
This will change if spirits or a go-wide-style fliers deck ever becomes a thing, but for now Id stick to playing Collision // Colossus
This is also a fine thing to have going on each turn