The Throne Room of the Gods

When Throne Room of the Gods enters the battlefield, choose
Greek or Roman. If you chose Greek, choose from Zeus, Hades,
or Posiden. If you chose Roman choose from Neptune,
Pluto, or Jupiter. If you chose Roman,
you may put a card you own from your sideboard
named Posiden, Pluto, or Neptune,
depending on what you chose. If you chose Greek,
you may put a card you own
from your sideboard named Posiden, Hades, or
Zeus onto the battlefield under your control.