The Black one Overlord of the Balemurk costs five for a 5/5 with two-cost and impending five turns, that mills four and then you'll raise a dork/planeswalker to your hand from your 'yard
You can get back lands youve cycled, use cards like Strip Mine once more, and get some land-based combos like Thespian's Stage + Dark Depths
Lets consider a deck of 20 untapped lands and 18 tapped lands, and 61 filler cards, and three variations of it where weve replaced a number of filler cards by either a ramp package, a draw package, or both
Its ultimate ability can play a huge role this season, as Theros Beyond Death is an expansion that focuses mainly on enchantments
While there won't be any surprises, you can't complain much when you're getting one of the generation's signature sets