The lifecost is interesting, since black has historically been better at card draw than green, but this seems to argue in a different direction, although green has always been good at drawing through creatures, specifically
Then, if that Vampire/Demon dies, you get to draw a card and create a tapped 4/3 Vampire Demon token to replace it
As for Sam, Lotal Attendant, he is a 2/4 creature that creates a food token at the beginning of combat on your turn
I will argue, though, that what really killed the hype for Set Champs was the fact that the prize card, Mirabel, Family Gatherer, was and still is completely unplayable
A 6-mana creature that must survive a turn cycle to have an impact doesnt line up with the current format, especially since this elder dinosaur can whiff