Squeakus and his Chicken Steed

Quiet as a Mouse(This creature cannot be blocked by creatures with higher power, toughness, or converted mana cost.)
Whenever Squeakus and his Chicken Steed deals combat damage to a player, create a 0/1 white Chicken creature token. When Squeakus and his Chicken Steed leaves the battlefield create a 1/1 white Legendary mouse creature token named Squeakus that has {w}:Ride, Chicken Token(They become a 1/2 creature named Squeakus and his Chicken Steed that when this creature would be destroyed,