The only other zombie arts to be printed more than twice overall are the above mentioned M10 Bud Cook token and Craig J Spearing's zombie from the second block to take place in Innistrad (more on that one later)
Like most Pokmon cards, the value of Heatran depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (SM Black Star Promos)
This might suggest the card deserves an even higher spot on this list
As for seeing ward across the table, you know there are hoops to jump through to get rid of something, but at least there's a chance
What are the top colorless creature recursion cards in Commander
Melira, the Living Cure Melira, the Living Cure will be a very helpful creature in All Will Be One Limited thanks to the prevalence of toxic creatures