Temple of Deceit
The prevalence of Teferi in Modern means that most people do not run Veil of Summer as a 3 or 4-of anymore, which used to be the case about a year ago
Still, the Dash ability of Ragavan, Nimble Pilferer means that it is a constant threat that your opponent needs to be aware of, and that in it of itself is powerful as it will force your opponent to sequence in such a way to respect the potential Dash attack
however, decimating their position with Hymns and Strip Mines, followed by a Drain for twelve or more, would generally leave them powerless
This devoid blue enchantment seems cracked in 7-drop happy affinity if they can take a turn off for it, which remains to be seen
That said, there could be room in the format for a mono-green deck with Nissa and Nykthos