Uncage the Menagerie
Oracle Text
Search your library for up to X creature cards with different names that each have converted mana cost X, reveal them, put them into your hand, then shuffle your library.
Card Rulings
7/14/2017 If you cast Uncage the Menagerie with X as 0, you’ll search your library and shuffle it, but you won’t be able to find any cards.
7/14/2017 For cards in your library with in their mana costs, X is considered to be 0.
Edit: NVM, I completely missread it. (thought you could search for ANY number of creatures with that CMC)
But in modern, 4 for 2X2, a snapcaster and a tarmo, is a somewhat broken, considering you can snapcast it again. In a sense, this is Squadron Hawk, but squadron snapcaster/tarmo.