Seymour Flux {4}{B}
Legendary Creature — Spirit Avatar
BlackCommander: legal
Identity
Black
EDHREC rank
#12,596
Cheapest printing
US$0.21
TCGplayer
Printings
2
At the beginning of your upkeep, you may pay 1 life. If you do, draw a card and put a +1/+1 counter on Seymour Flux.
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.