Plays on planet Gateway (limit one). Once per turn, one or
more personnel present may time travel to a time location
in this quadrant, or may return here from there (with any of
owner's other personnel present).
OR
Plays once each turn to
nullify any card that is closing Guardian, or to draw up to four
cards if your Archaeology or Anthropology personnel just
time traveled back to Guardian; place doorway out-of-play.