Agrus Kos, Eternal Soldier {3}{W}
Legendary Creature — Spirit Soldier
Identity
Boros
EDHREC rank
#12,413
Cheapest printing
US$1.65
TCGplayer
Printings
1
Vigilance
Whenever Agrus Kos becomes the target of an ability that targets only it, you may pay {1}{R/W}. If you do, copy that ability for each other creature you control that ability could target. Each copy targets a different one of those creatures. ({R/W} can be paid with either {R} or {W}.)
Keywords: vigilance
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.