Susan Foreman {1}{G}
Legendary Creature — Time Lord
GreenCommander: legal
Identity
Green
EDHREC rank
#19,154
Cheapest printing
US$0.28
TCGplayer
Printings
4
If you would planeswalk, instead look at the top two cards of your planar deck, put one on the bottom of your planar deck and the other on top, then planeswalk.
{T}: Add {G}.
Doctor's companion (You can have two commanders if the other is the Doctor.)
Keywords: doctor's companion
Every printing
highest TCGplayer market first; a card with only a thin single listing shows its low
In short
A Commander deck is a commander and 99 other cards, one copy of each (except basic lands), all inside the commander's colour identity. Paste a full list into the deck price calculator to price it and check it against the format.