Released in English on August 2, 2019, this was part of the Sun and Moon-related Unified Minds expansion
Priest of Forgotten Gods is exactly like that for sacrifice strategies
I would never go back, but it is certainly the kind of thing that tests you day in and day out
Again, the mana makes it feel a little more suspect than something like Phyrexian Arena, however, you do get to look at the cards you mill and make your choice from a wider range, making this card far more helpful in late game scenarios where you are looking for something specific
They care about instants and sorceries and have a lot of cards that reward you for casting them
Its an artifact too, which matters because several common blue cards care about artifact synergies