Jacob Hauken, Inspector // Hauken's Insight {1}{U}
Legendary Creature — Human Advisor // Legendary Enchantment
BlueCommander: legal
Identity
Blue
EDHREC rank
#11,859
Cheapest printing
US$0.47
TCGplayer
Printings
5
{T}: Draw a card, then exile a card from your hand face down. You may look at that card for as long as it remains exiled. You may pay {4}{U}{U}. If you do, transform Jacob Hauken.
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At the beginning of your upkeep, exile the top card of your library face down. You may look at that card for as long as it remains exiled.
Once during each of your turns, you may play a land or cast a spell from among the cards exiled with this permanent without paying its mana cost.
Keywords: transform
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.