Grey Cult Summoners

When Grey Cult Summoners enters the
battlefield, inscribe. If you gained life this
turn, inscribe twice instead. Then you gain
4 life. (To inscribe, create a Pact token. It's an
artifact with "{4}, Sacrifice this artifact: Draw a
card. This ability costs {1} less to activate for
each other creature or Pact you've sacrificed
this turn.")