Arthur pairs phenomenally well with Zinnia, but Arthur could just as easily be the commander of his very own deck
And in the case of MTGO, I wasn't even going to end up with chunks of cardboard that I could keep and show to my grandkids in case I was wrong about what's good
While this can be a threat, and you should watch out for growing Ornithopters, most of the time that means that you will take no combat damage and more than half of all decks rely on combat damage to win the game
Other reasons Pacifism effects suck are that you can also still sac off the creature for value, bounce and recast it free from its aura, give it protection such that the aura falls off, or simply kill the Pacifism and have a potentially flash haste version of your guy back
A: Time for another history lesson
Eight of the Top 10 cards in todays list are creatures, as well as our honorable mention