Preston, the Vanisher {3}{W}
Legendary Creature — Rabbit Wizard
WhiteCommander: legal
Identity
White
EDHREC rank
#3,840
Cheapest printing
US$49.78
TCGplayer
Printings
1
Whenever another nontoken creature you control enters, if it wasn't cast, create a token that's a copy of that creature, except it's a 0/1 white Illusion.
{1}{W}, Sacrifice five Illusions: Exile target nonland permanent.
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.