Work in progress -- currently 41 cards while I test out Yara and a couple of options
Fun Rainbow list with big vampires chilling at the cradle of life.
The deck is pretty fun with some crazy synergies, You're basically looking to stall early on with tokens and venomfang, and get down your serpent dens as soon as possible. You have some midrange threats with cognate, oak of dadona and serapis. With token generators down you want to survive with as much hp as you can until 5-6 mana where you can use misanthropia, magmataur or gigantomachia to wipe the board. Your late game is where it all kicks off with hard to remove big boys, Sapo and Protas grinding down your opponent.
You're looking to finish the game in one of a few ways, either pure value from undying 7 mana dudes, surprise damage to the face from guise of phobos, or a big combo using stairway to hades or red carnival and rush minions.
Cradle of life is a fantastic card. You can turn a midrange threat into an absolute stonker. It's great on your larger threats as well - anything with 6 health will get the overrun on the next turn just off the awaken bonus. In the very late game with other life steal miniosn on the board it becomes insane as the life tap from the protas can turn pretty much anything into a force to be reckoned with. The hp will stay with the minion if you ever want to replace the enchant as well. Just watch out for suppression, which can strip all of that, as well as being a great counter to your big protas. So make sure to diversify your threats as much as you can. Unkillable threats are only unkillable until your opponent draws the right card.