Vada, the Plains Conqueror

When Vada, the Plains Conqueror enters the battlefield create a X/X white rhino legendary creature token named Vaga, Vada's Horn that has, "Mount {w}{r} ({w}{r}: Target creature you control switches toughness with this creature until either creature leaves the battlefield.)" and "If this creature is mounted then it gains trample and haste."
If Vada, the Plains Conqueror is mounted it gains trample and haste.