Tam, the Possibility {1}{G}{U}
Legendary Creature — Gorgon Wizard
Identity
Five-color
EDHREC rank
#13,630
Cheapest printing
US$0.36
TCGplayer
Printings
3
Planeswalker spells you cast cost {1} less to cast.
{W}{U}{B}{R}{G}, {T}: Proliferate X times, where X is the number of planeswalker types among planeswalkers you control. (To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there.)
Keywords: proliferate
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.