When reading this card one would assume that this is only good in Constructed formats. However, Modern Horizons offers a ton of Changelings that can support any other tribe that you can draft in Limited.
Then, this enchantment becomes really valuable, and it has the potential to win you games one by one.
The most significant tribe in the set are Slivers, so focus on them while drafting. But other creature types should also do the trick.