Ultimate Green Goblin {1}{B/R}{B/R}
Legendary Creature — Goblin Villain
Identity
Rakdos
EDHREC rank
#6,951
Cheapest printing
US$0.32
TCGplayer
Printings
4
At the beginning of your upkeep, discard a card, then create a Treasure token.
Mayhem {2}{B/R} (You may cast this card from your graveyard for {2}{B/R} if you discarded it this turn. Timing rules still apply.)
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.