Dusk Wind, Slaver of the Seas

Crew 4
Whenever Dusk Wind, Slaver of the Seas deals combat damage to an opponent, gain control of target creature that player controls for as long as you control Dusk Wind. It gains "This creature
can't attack or block" and "{t}: add {b}"
At the beginning of your upkeep, put a -1/-1
counter on each creature you control that an
opponent owns.