Polukranos, World Eater {2}{G}{G}
Legendary Creature — Hydra
GreenCommander: legal
Identity
Green
EDHREC rank
#11,083
Cheapest printing
US$0.60
TCGplayer
Printings
3
{X}{X}{G}: Monstrosity X. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.)
When Polukranos becomes monstrous, it deals X damage divided as you choose among any number of target creatures your opponents control. Each of those creatures deals damage equal to its power to Polukranos.
Keywords: monstrosity
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.