Doctor Blight has one of the coolest looking card design in my opinion. He looks like a card from death team more than neutral one. If I'm not mistaken this is the only card which 5 ability and all of these 5 abilities makes enemy team weaker.
Doctor Blight can be used with every team and camouflage ability helps him to stay alive longer. If enemy uses excessive healing monsters then it will be wasted because of the affliction.
Currently the cheapest maxed out one costs 588 usd on the market which is a good price compered last year prices where it was trading over 100 bucks per bcx.