Cult of the Weaver

Play this card only if "Jessica the Weaver" or
another "Jessica" card is in your graveyard.
At the beginning of your end step search your
gravard for a Knight, Claric, Rogue, or Wizard.
Create a 1/1 mouse token for each.
You may then sacrifice four mouse tokens to play
a legendary creature or Planswalker for free.