For six mana, you get an uncounterable, evasive and hasty creature that is sure to demand an answer the second it enters play
It also helps that this is a very cheap way to both save your creatures and start the ball rolling with proliferate and counters-moving tomfoolery, so get your copies cheap while you can
There are many types of removal spells
We've looked through the past as well, with uncommon legendary creatures that were printed years ago, and even commanders that were originally printed as rares and have been downshifted over time, like Zada, Hedron GrinderZada, Hedron Grinder and Bladewing the RisenBladewing the Risen
Could Scapeshift really see play in Standard next season
But ultimately, I think this will end up being one of the cuts we make to upgrade the deck, as this is a bit lacking as a win condition, its most common use-case likely being to simply gum up the ground a bit