Granted, Bitter Triumph is card parity, while this is card disadvantage, and haste is a big part of what puts Bitter Reunion over, but making Treasures is a way for Reanimator decks to hard-cast their big creatures and is just a generally powerful thing to do
1x Showcase Artifact Mutation
A counterspell for noncreatures at two mana that also prevents your opponents from casting noncreature spells for the rest of the turn feels pretty powerful, even though its not without its limitations
While I can tell you that many more packs of Zendikar were manufactured than of Coldsnap, I cant tell you how big that gap is
Is it not painfully obvious
Many Commander players run tri lands because, in a format where you can play a bunch of different colors, you want every possible way to fix your mana