Murktide Regent is an absolute monster that can easily shut down a game once it enters the battlefield, and the nature of the card means that you'll probably have at least one counterspell to protect it once it's out
Goldberry, River-Daughter Goldberry, River-Daughter has the ability to create an infinite turn loop for you with Magosi, the Waterveil and any consistent form of proliferate
Its full of ample value if you do and recurring a [casthaven]Sundering Growth[/casthaven], [casthaven]Wayward Temple[/casthaven] and a fetchland feels pretty good
Some Magic: The Gathering cards are just a little too good, particularly in more specialized formats
It turned the downside of Hellbent aggressive strategies into a massive upside
Your opponents creatures entering the battlefield tapped is great protection against creatures with haste, especially scary ones like Thraximundar