Undying King of Koopas

When Undying King of Koopas, enters the battlefield, exile your Bowser, King of Koopas. If Bowser, King of Koopas is exiled this way as commander, Undying King of Koopas becomes commander.
Every creature of type Turtle gets a +1/+2
Undying King of Koopas has menace or can
grant one creature menace in his stead this turn.