Cards like Narset of the Ancient Way and Sorin, Grim Nemesis benefit from discarding a split card since it deals damage equal to the mana cost
Its an interative experience thats great for kids
In Tarkir , that obviously involved a lot of dragons, but in Lorwyn Eclipsed , it seems like Behold will lean into the various tribal themes
Its possible that some time in the future of Standard the mana dries up and we see mono-colorless or close to it pop up, or a single card gets printed that makes a deck in an Eternal format tighten up its mana, but odds are until more sets are printed with this mechanic, mono-colorless isnt much more viable than it is now
Black Panthers support cards also help underscore this theme
Whenever this creature attacks, look at the top four cards of your library