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
A card is face down in the exile zone only if the effect or action that put it there specifically says it puts it there face down (like the foretell ability)
Riptide Shapeshifter Rarity: Uncommon TYPE: Creature SUBTYPE: Shapeshifter CMC: 5 Mana cost: USD: $0.30 EUR: 0.24 TIX: 0.04 EDHREC RANK: 22534 (3/3) , Sacrifice this creature: Choose a creature type
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
As for Sam, Lotal Attendant, he is a 2/4 creature that creates a food token at the beginning of combat on your turn