Leonardo, Big Brother {2}{W}
Legendary Creature — Mutant Ninja Turtle
WhiteCommander: legal
Identity
White
EDHREC rank
#14,255
Cheapest printing
US$0.22
TCGplayer
Printings
1
Sneak {W} (You may cast this spell for {W} if you also return an unblocked attacker you control to hand during the declare blockers step. He enters tapped and attacking.)
Leonardo gets +1/+0 for each other creature you control.
Keywords: sneak
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.