Grim Monolith earns its spot among the best mana rocks in MTG for decks that know exactly what they want to do with a sudden burst of colorless mana
Those days look to be behind us with Day of Judgement returning to Standard, providing a hugely important piece to control decks, allowing a reset of the game that can often be a three, four, or five-for-one (or more!)
The decks are not Standard legal (unless the card is from a Standard-legal set)
Cecil, Dark Knight/Cecil, Redeemed Paladin
Wan Shi Tong, Librarian People are freaking out about Wan Shi Tong, Librarian for cEDH, and its not hard to see why
Regardless, the ring is overtuned, but I guess thats to be expected given that Wizards of the Coast made a whole marketing campaign around opening it