  Using Public Data Release of Zwicky Transient Facility observations, we found
that MGAB-V859 and ZTF18abgjsdg are dwarf novae and show both ER UMa-type and Z
Cam-type states. There had been only two dwarf novae showing similar
transitions between the ER UMa-type and Z Cam-type states. MGAB-V859 showed
both a transition from the ER UMa-type state to a long standstill in 2019 and a
Z Cam-type state in 2020. During the standstill in 2020, this object faded
twice and showed dwarf nova-type variations. ZTF18abgjsdg usually showed ER
UMa-type behavior but standstills were seen in 2018 and 2019. The supercycles
of these objects during the typical ER UMa-type phase were 55 d and 58 d,
respectively. These objects provide additional evidence that some ER UMa stars
indeed bridge between dwarf nova and novalike states as proposed in Kato et al.
(2016).
