Xerex Strobe-Knight is a uncommon Creature — Human Knight card from March of the Machine (MOM), collector number 85. Current market price: $0.13 (foil $0.28), TCGplayer market prices via Scryfall.
Flying, vigilance {T}: Create a 2/2 white and blue Knight creature token with vigilance. Activate only if you've cast two or more spells this turn.