Sergeant-at-Arms is a common Creature — Human Soldier card from Dominaria (DOM), collector number 32. Current market price: $0.20 (foil $0.15), TCGplayer market prices via Scryfall.
Kicker {2}{W} (You may pay an additional {2}{W} as you cast this spell.) When this creature enters, if it was kicked, create two 1/1 white Soldier creature tokens.