  In this study, we investigate the parameterized Konoplya-Rezzolla-Zhidenko
(KRZ) black hole (BH) spacetime in the presence of an external asymptotically
uniform magnetic field. We first examine the innermost stable circular orbit
(ISCO) radii for both neutral and charged test particles, demonstrating that
the deformation parameters, $\delta_1$ and $\delta_2$, reduce the ISCO values.
Subsequently, we assess the energy efficiency of the magnetic Penrose process
(MPP) for an axially symmetric parameterized BH, analyzing the effects of the
deformation parameters and the magnetic field on the energy extraction process.
Our findings indicate that the rotational deformation parameter $\delta_2$ is
crucial for the efficiency of energy extraction from the BH. The synergy
between the rotational deformation parameter and the magnetic field
significantly boosts the energy extraction efficiency, with values exceeding
$100\%$. Interestingly, for extremal BHs with negative $\delta_2$ values, the
energy efficiency increases, in contrast to Kerr BHs where the MPP effect
diminishes. Additionally, we explore the astrophysical implications of the MPP
by deriving the maximum energy of a proton escaping from the KRZ parameterized
BH due to the beta decay of a free neutron near the horizon. Our results show
that negative $\delta_2$ values require stronger magnetic fields to achieve
equivalent energy levels for high-energy protons, providing deeper insights
into high-energy astrophysical phenomena around the parameterized BH.
