When you consider that rares and mythics are far more valuable than commons and uncommons are, which are pretty easy for everyone to access, in practice, this means that for every pack of The Brothers War you buy (assuming you eventually buy 10 to get the Golden Pack), you are essentially getting 1.6 packs worth of value, making Golden Packs perhaps the most generous improvement to the Arena economy ever
When a deck wants one of these effects, it probably wants multiples, so he falls into Commander builds that really want to create big turns, like Korvold, Fae-Cursed King and Yisan, the Wanderer Bard
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ice, which instead of doing damage bounces cards back into an opponents hands or libraries, is assigned to blue, which reflects that colors archetypal focus on interruption and control mechanics
or pick and choose the ones you want