
Whenever one or more other permanents phase out and whenever one or more other cards are put into exile from anywhere, put a time counter on The War Doctor.
Whenever The War Doctor attacks, it deals damage equal to the number of time counters on it to any target. If a creature dealt damage this way would diedieA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying. this turn, exile it instead.
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Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
Any creature with Doctor's companion can be a second commander alongside a Time Lord Doctor.