The Capitoline Triad {10}
Legendary Creature — God Artificer
ColorlessCommander: legal
Identity
Colorless
EDHREC rank
#7,491
Cheapest printing
US$2.64
TCGplayer
Printings
3
Those Who Came Before — This spell costs {1} less to cast for each historic card in your graveyard. (Artifacts, legendaries, and Sagas are historic.)
Exile any number of historic cards from your graveyard with total mana value 30 or greater: You get an emblem with "Creatures you control have base power and toughness 9/9."
Keywords: those who came before
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.