The most natural comparison is the Double Faced Cards in Zendikar Rising that were either spells or tapped lands, but when you played DFCs you could have cards with a range of casting costs, which meant that youd typically want to cast some of them in the early to mid game
In a format full of cantrips, wheels, and value engines, that makes it one of the most disruptive MTG black cards printed in years
One final reminder: this is a +1, so its not only removal, but Oko becomes tougher to kill with each elk
Once the cards are actually put into a database and printed, there is a more rigorous process for putting all of the needed information onto the card
Running twelve creatures is light for Welcoming Vampire, but if either token maker sticks, thats all you need