Alhammarret, High Arbiter {5}{U}{U}
Legendary Creature — Sphinx
BlueCommander: legal
Identity
Blue
EDHREC rank
#18,624
Cheapest printing
US$0.34
TCGplayer
Printings
3
Flying
As Alhammarret enters, each opponent reveals their hand. You choose the name of a nonland card revealed this way.
Your opponents can't cast spells with the chosen name (as long as this creature is on the battlefield).
Keywords: flying
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.