Dusk Legion Duelist is a rare Creature — Vampire Soldier card from March of the Machine Promos (PMOM), collector number 11p. Current market price: $1.63 (foil $3.63), TCGplayer market prices via Scryfall.
Vigilance Whenever one or more +1/+1 counters are put on this creature, draw a card. This ability triggers only once each turn.