Flying (This creature can't be blocked except by creatures with flying or reach.)
Other black creatures get +1/+1.
Nonblack creatures get -1/-1.
Cast Ascendant Evincar as a flying mono-black lord that pumps your whole board +1/+1 while shrinking every nonblack creature your opponents control. You weaponize the -1/-1 effect as repeatable board control, grind value with black staples, and close games with a buffed go-wide team or big mono-black finishers.
Doubles as a one-sided anthem and a soft board wipe against nonblack creature decks
Mono-black gives access to elite tutors, ramp, and removal for consistency
Flying body protects itself and pressures opponents in the air
Synergizes powerfully with token and devotion strategies
Six mana and dies to almost any spot removal, resetting your -1/-1 effect
The -1/-1 is symmetrical-ish only against nonblack, so mono-color black opponents are unaffected
Mono-black struggles to deal with resolved artifacts and enchantments
Vulnerable to board wipes since you commit to a wide black board