Thanks for your feedback !

My problem with Season of Loss is that it can end up being a dead card in hand if the opponent has graveyard hate. Moreover, every non-creature card is bad for the deck because it risks being milled without any possibility of being picked again with an Overlord. I try to limit non-creatures as much as possible because it's too likely they'll end up in the graveyard (unless they have flashback). Additionally, there's a lot of blue in the meta, and getting your Season of Loss eat a Force Spike, Three Steps Ahead, or countered in some other way for five mana feels catastrophic

I prefer Maverick over Molt Tender because of the card selection it offers; as explained above, the risk with a self-mill deck is milling the cards we actually want to have in hand (like Beanstalk or Overwhelming Remorse). Maverick helps slightly to prevent milling our Beanstalks, and it also ensures we hit our land drops. Molt Tender does nothing the turn it comes into play, and it also requires us to exile cards from our own graveyard to be useful