Kefnet the Mindful {2}{U}
Legendary Creature — God
BlueCommander: legal
Identity
Blue
EDHREC rank
#7,434
Cheapest printing
US$0.49
TCGplayer
Printings
4
Flying, indestructible
Kefnet can't attack or block unless you have seven or more cards in hand.
{3}{U}: Draw a card, then you may return a land you control to its owner's hand.
Keywords: flying, indestructible
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.