Gwenna, Eyes of Gaea {2}{G}
Legendary Creature — Elf Druid Scout
GreenCommander: legal
Identity
Green
EDHREC rank
#1,673
Cheapest printing
US$5.24
TCGplayer
Printings
4
{T}: Add two mana in any combination of colors. Spend this mana only to cast creature spells or activate abilities of creature sources.
Whenever you cast a creature spell with power 5 or greater, put a +1/+1 counter on Gwenna and untap it.
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.