  AgF$_2$ is a correlated charge-transfer insulator with properties remarkably
similar to insulating cuprates which have raised hope that it may lead to a new
family of unconventional superconductors upon doping. We use ab initio
computations to study doping strategies leading to metallization. Because the
upper Hubbard band is very narrow electron doping leads to undesired strongly
self-trapped states (polarons). For the hole-doped case, polaron tendency is
stronger than for cuprates but still moderate enough to expect that heavily
doped compounds may become metallic. Since the strong electron lattice coupling
originates in the strong buckling we study also an hypothetically flat
allotrope and show that it has excellent prospect to become metallic. We
compare the AgF2 behavior with that for the hole-doped conventional cuprate
La$_2$CuO$_4$ and electron-doped Nd$_2$CuO$_4$. Our results show a clear path
to achieve high temperature superconductivity in silver fluorides.
