
TrampleTrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking.
Whenever you cast a historichistoricArtifacts, legendary cards and Sagas are historic. spell, Jamie McCrimmon gets +X/+X until end of turn, where X is that spell's mana valuemana valueArtifacts, legendaries, and Sagas are historic.. (Artifacts, legendaries, and Sagas are historic.)
Doctor's companionDoctor's companionYou can have two commanders if the other is the Doctor. (You can have two commanders if the other is the Doctor.)
Hover an underlined rule to see what it means.
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.
Doctor's companion lets this card be a second commander alongside any Time Lord Doctor.