You could also theme a Humans deck around your favourite plane because odds are it features Humans (unless you're a big Lorwyn fan)
On top of that, each creature you steal becomes a mercenary, meaning you exile more and more cards as turns pass, especially when you run a mercenary-themed deck or effects that focus on stealing creatures from your opponents in other ways
Well, who's laughing now
While I didn't shove in a full Dwarf Tribal subtheme into this section, I did add a couple strong choices that synergize well in the deck, with the best by far being Magda, Brazen Outlaw: tap to crew vehicles, make treasure, spend that treasure to cast spells or cheat out Parhelion II
Plane - Phyrexia New Grand Ossuary Whenever a creature dies, its controller distributes a number of +1/+1 counters equal to its power among any number of target creatures they control
That's pretty rare in W/R