I've been playing mono white D&T, white trash, hatecats, or whatever you wanna call it for a decent bit now, and this card is going to really change how the decks are constructed. Right now we have shops competing with eldrazi competing with white trash, and there are some mixes like shops with TKS and Reality Smasher, Eldrazi with Thalia/Containment Priest, and D&T with Eldrazi Displacer.
I think this card is going to separate the prison strategies a bit more since this does not play well with the eldrazi cards popping up in some hatecats lists, but it does make the deck more resilient and more consistent.
The main problem here is that it costs 3 mana, but some people were already playing Ancient Tombs to power out the new Thalia, Vryn Wingmare, and Eldrazi Displacer in their lists; so that might be a solution to the problem if you don't want to go heavy into artifact acceleration (I still think you do).
Obviously the biggest thing going for this card is it lets you play single copies or reduced amounts of the cards you want to play, so that you only find them when you need them since most of the hatebears don't do anything in multiples (Spirit of the Labyrinth, Containment Priest, etc). It also allows you to play cards that are normally sideboarded in your main deck so that you have a better chance game 1 against less common decks without "wasting" slots against more popular decks. I've been running Containment Priest main deck just to have a shot against Dredge and Oath, but now I can trim down to a single copy to fetch with this guy and move the others to the sideboard.
Overall, really excited about this card and its impact on the format.