It has the cumulative upkeep of paying 2 life which is easily mitigated, and it requires you to sacrifice a land when it enters the battlefield
They're cute, and appropriate for a vampiric villain
There will be some scenarios calling for a combat trick, but those events will be less frequent
People are very excited, but Im personally a bit more skeptical as you need a second land of the right color (and type!) if you want to get the second color from these, which is likely your splash color
Trainers Pokmon Bring the Heat Trainer-owned Pokmon return in this expansion in a huge way as well, which was one fan-favorite part of the original Rocket card set back during the vintage Pokmon TCG days
Each possesses different abilities, skills, rewards, and classifications