Making 1/1 lifelinkers is a reasonable trade for the lower starting loyalty as you grow your life total and Sorins loyalty simultaneously, even if all you are doing is chump blocking every turn
Its not an adventure spell, but Uro is fantastic when your strategy is self-mill
By the way, BGU mana cost is also quite fitting (at least for me), possibly representing Sin's connections to oceans (blue), death (black), and the natural cycle it's strangely bound to (green)
Historically, the play rate (how much of the metagame share a deck has) of those decks has been low enough that it hasn't been an issue
One of the best perks of Decidueye is that not only does it have a hefty amount of health, but it also can do a moderate amount of damage per turn
Four commons, two uncommons will happen 40% of the time