Prior to an official release of Magic: The Gathering, Richard Garfield and his test group of players were effectively forcing the game into existence, it literally was
That is left up to your imagination, of course, but perhaps the sight of the Mimikyu itself, watching TV in the darkness, is enough to give anyone the creeps, even if they are its Trainer
Dont let them take you for a ride on any specific card, but the increased cost would be put to good use if the margin is reasonable
From a small sample, Lightning and Psychic Energy appeared the most often (in Gym Heroes it was Lightning Energy, Gym Challenge I did not look at)
Sure, Darkness cards dont have that pitch black card body or the yellow borders, but the modern shade combined with the silver borders does just as well
Reliable ramp and efficient fixing allow both commanders to enter play on curve and remain available after removal