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
Silverclad Ferocidons Silverclad Ferocidons has one of the most punishing enrage mechanics, especially because it doesnt specify a permanent type
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Sorry it's not hitting the seventh spot...but that would be rough to sell...amiright
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.
Thats why I love The Nipton Lottery, which staples a fun mini-game onto the effect