Commander Liara Portyr {3}{R}{W}
Legendary Creature — Human Soldier
Identity
Boros
EDHREC rank
#7,892
Cheapest printing
US$0.22
TCGplayer
Printings
3
Whenever you attack, spells you cast from exile this turn cost {X} less to cast, where X is the number of players being attacked. Exile the top X cards of your library. Until end of turn, you may cast spells from among those exiled cards.
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.