Arni Metalbrow {2}{R}
Legendary Creature — Human Berserker
RedCommander: legal
Identity
Red
EDHREC rank
#11,109
Cheapest printing
US$0.18
TCGplayer
Printings
5
Whenever a creature you control attacks or enters attacking, you may pay {1}{R}. If you do, you may put a creature card with mana value less than that creature's mana value from your hand onto the battlefield tapped and attacking.
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.