Well, here's a list of cards that are absolutely must haves, and in some cases, you might need to really open your wallet for
Be sure to keep your store clean and hygienic for the players or they might leave
It's ideal to be able to pull off either move once everyone's life is below 20
If every undead or mutated creature had to state its pre-death/mutation type, there'd be way too many of the core tribes in the game
Speaking of big, scary Vampires, Bloodline Keeper arrives as a 3/3 flying body that keeps birthing 2/2 Vampire tokens and eventually becomes a 5/5 flying body that gives other Vampires +2/+2
Frankly, any big spell you cast like this should be enough to make transforming Hauken worth it, so the real question is what deck wants a big card advantage engine like this