Master Pakku {1}{U}
Legendary Creature — Human Advisor Ally
BlueCommander: legal
Identity
Blue
EDHREC rank
#11,897
Cheapest printing
US$0.12
TCGplayer
Printings
1
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever Master Pakku becomes tapped, target player mills X cards, where X is the number of Lesson cards in your graveyard. (They put the top X cards of their library into their graveyard.)
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.