Lydia Frye {2}{U/B}
Legendary Creature — Human Assassin
Identity
Dimir
EDHREC rank
#7,493
Cheapest printing
US$0.23
TCGplayer
Printings
3
Lydia Frye can't be blocked by creatures with power 3 or greater.
At the beginning of your end step, surveil X, where X is the number of tapped Assassins you control. (Look at the top X cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
Keywords: surveil
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.