The Squadron Sinister {5}{U}{R}
Legendary Creature — Human Villain
Identity
Izzet
EDHREC rank
#11,161
Cheapest printing
US$0.29
TCGplayer
Printings
3
Flying, haste
Other Villains you control get +2/+2 and have flying and haste.
Mayhem {3}{U}{R} (You may cast this card from your graveyard for {3}{U}{R} if you discarded it this turn. Timing rules still apply.)
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.