Sure, your opponent gets too as well, but if youre dropping a creature with an exceptionally powerful enter the battlefield trigger, like Atraxa, Grand Unifier, a creature that is practically unstoppable like Emrakul, the Aeons Torn, or an enchantment that gives you free rein to do whatever you like Omniscience, you basically guaranteed a win
Rukarumel, Biologist Rukarumel, Biologist allows you to create a deck with two creature types: Slivers and whatever other creature type you choose when they enter the battlefield
Commander players shrug this off pretty well
But I can imagine there are shells where Sephiroth performs even better
The connected commons and uncommons have gone away, and part of making the booster playable included balancing colors, so the new Play Boosters will do that
I wonder what a Pauper Commander deck built around Obyra would look like, since theres been a fair number of common faeries in black and blue over the years