Lazav, House Dimir Mastermind

When Lazav, House Dimir Mastermind enters the battlefield, destroy target creature. Lazav House Dimir Mastermind becomes that creature with {x} +1+1 counters
Lazav House Dimir has "{3}{u/b}{u/b}{t} Destroy target creature Lazav, House Dimir Mastermind becomes that creature" and Manipulator (Whenever a creature an opponent controls dies, you create a copy of it except it is a 1/1 black and blue assassin in addition to its other colors & types)