The fact that they benefit from being both creature and artifact types and are flexible enough to go in every deck brought lots of balancing problems to some Constructed formats
It is exile as well which makes it a lovely way to deal with utility creatures
Bats already have a bloodsucky lifegain thing going, and Pest tokens all have one trigger or another that gains you life, so thats a good starting place if you want to focus on just two creatures with Blech, Loafing Pest
Once you establish mana dorks and rocks, you can start to stabilize, but you may be made a target early on as Dragons are known for their ability to snowball once they have enough mana to do so.
Silverclad Ferocidons Silverclad Ferocidons has one of the most punishing enrage mechanics, especially because it doesnt specify a permanent type
Return to the plane of glorious gothic horror and dig up fan-favorite reprints from every Innistrad set ever made with Innistrad Remastered