Woman Who Walked the Earth — When Martha Jones enters the battlefield, investigate (To investigate, create a colorless Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.").
Whenever you sacrifice a Clue (A Clue is an an artifact with ", Sacrifice this artifact: Draw a card."), Martha Jones and up to one other target creature can't be blocked this turn.
Doctor's companion (You can have two commanders if the other is the Doctor.)
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