Skanos Dragonheart {4}{G}
Legendary Creature — Dragon Ranger
GreenCommander: legal
Identity
Green
EDHREC rank
#11,891
Cheapest printing
US$0.23
TCGplayer
Printings
3
Whenever Skanos Dragonheart attacks, it gets +X/+X until end of turn, where X is the greatest power among other Dragons you control and Dragon cards in your graveyard.
Choose a Background (You can have a Background as a second commander.)
Keywords: choose a background
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.