Some of those were left over so he just brought us everything, and we included it in the lot
It's the color that gets the most creatures overall, and its a very creature-oriented color, especially for aggro decks
In more social games, theres generally an agreement that every deck should get to do its thing, whatever that is
For example, if you somehow used Souls of the Lost to craft Mastercraft Raptor (perhaps because it became a copy of a Dinosaur), its power while in exile is equal to the number of permanent cards in your graveyard, and Mastercraft Raptor's power will change as the number of permanent cards in your graveyard changes
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Along with that, it also gives your other legendary and artifact spells flash, which is incredible