Given Valgavoth's story in Duskmourn, being the enemy of the table at large is an absolute flavor win for the story but it's easy to call something a flavor win when you don't get knocked off the table for running it
Yes, saga creatures get sacrificed after their last chapter
After milling half of your opponents deck, you can use Riverchurn Monuments Exhaust ability to mill your opponent out
(11/8/2024) If you put a permanent with a kicker ability onto the battlefield without casting it, you can't kick it
The Counter effect allows a character card to be trashed to add the specified value to the defending card's power, or an event to activate the effect as detailed on the card
If you see this in a Commander deck, there's a pretty good chance you'll also come up against a Lashwrithe, given that the latter is an upgraded homage to the former and that they both power up mono-black decks so well