(They create a Clue token.) II, IV Create a 2/2 black Alien Angel artifact creature token with first strike, vigilance, and "Whenever an opponent casts a creature spell, this token isn't a creature until end of turn." I, III Choose target creature
Personally, I play Edgar Markov mainly because I have a wide range of options with the three mana colours red, black and white and I like vampires in their lore and card design, especially since the new Innistrad Edition
On top of that, instead of banning cards outright, cards tend to simply get restricted, which means that you can only have one of them instead of the usual four
But if your opponent is playing a permanent-heavy list like Animar, Soul of Elements, you might not get a single token out of them