Its not quite as good as a Thoughtseize, but its better than your opponent choosing to discard the card that matters the least
Mana of any type can be spent to cast spells this way
End the game in installments of UUUU: UUU to cast 3 Auguries to +1 poison counters on your opponent while digging to more Auguries/Witnesses, then the last U to Witness to shuffle it all back in and do it once more
City of Brass had been printed in Chronicles so it was Standard legal, and players had allied-colored pain lands to utilize as well
If you can get Cinderslash Ravager down to three or four mana you're in pretty good shape, and casting it for two has got to feel real good
Of the five "base" color combinations combining adjacent colors, this is, by far, my favorite combination for drafting a generic unknown environment such as a random Cube, as well as Abedraft, a draft with every card ever printed