  X-ray catalogues provide a wealth of information on many source types,
ranging from compact objects to galaxies, clusters of galaxies, stars, and even
planets. Thanks to the huge volume of X-ray sources provided in the 3XMM
catalogue, along with many source specific products, many new examples from
rare classes of sources can be identified. Through visualising spectra and
lightcurves from about 80 observations included in the incremental part of the
3XMM catalogue, 3XMM-DR5, as part of the quality control of the catalogue, we
identified two new X-ray sources, 3XMM J183333.1+225136 and 3XMM
J184916.1+652943, that were highly variable. This work aims to investigate
their nature. Through simple model fitting of the X-ray spectra and analysis of
the X-ray lightcurves of 3XMM J183333.1+225136 and 3XMM J184916.1+652943, along
with complementary photometry from the XMM-Newton Optical Monitor, Pan-Starrs
and the Stella/WiFSIP and Large Binocular Telescope (LBT) spectra, we suggest
that the two sources might be magnetic cataclysmic variables (CVs) of the polar
type and we determine some of their properties. Both CVs have very hard
spectra, showing no soft excess. They are both situated in the local
neighbourhood, located within $\sim$1 kpc. 3XMM J183333.1+225136 has an orbital
period of 2.15 hours. It shows features in the lightcurve that may be a total
eclipse of the white dwarf. 3XMM J184916.1+652943 has an orbital period of 1.6
hours. Given that only a small sky area was searched to identify these CVs,
future sensitive all sky surveys such as the eROSITA project should be very
successful at uncovering large numbers of such sources.
