Unlike other protection spells, Teferis Protection saves your entire board and you, the player
Being a Deputy of Detention but getting all your opponents simultaneously
For three mana, Fraying Sanity is a Blue Curse that reads, At the beginning of each end step, enchanted player mills X cards, where X is the number of cards put into their graveyard from anywhere this turn. As above, thats great if youre in mill, but kind of rubbish otherwise
So, let's break this down by section, kicking things off with options for counter decks
Whittle your opponent down, and Zidane, Tantalus Thief becomes an effective finisher that does better than remove a blocker
The Artifact Creature limitation also means plenty of green Creatures that normally can make use of +1/+1 counters (Pelt Collector, Kalonian Kydra etc.) will just be less useful