Silumgar, the Drifting Death {4}{U}{B}
Legendary Creature — Dragon
Identity
Dimir
EDHREC rank
#5,507
Cheapest printing
US$0.40
TCGplayer
Printings
4
Flying, hexproof
Whenever a Dragon you control attacks, creatures defending player controls get -1/-1 until end of turn.
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.