Since M21, mill has become a keyword that appears all over Magic, especially on blue cards
Number 42 Language English Legal Formats Commander, Legacy, Modern, Pioneer, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Standard, Timeless Rulings (9/15/2013) When you scry, you may put all the cards you look at back on top of your library, you may put all of those cards on the bottom of your library, or you may put some of those cards on top and the rest of them on the bottom
I converted this slot to the aforementioned Tate & Liza, but I did miss the last draw 7 effect
I'd say the game is worth playing for a play-through, but I don't think it's a game you will play for maybe two play-throughs
Taking all of this into consideration, I believe that the historic mechanic from Dominaria will have an impact in Limited and in the Standard format
Emblems are typically hard-won, and losing one to a 2-mana instant would be incredibly frustrating