Shadrix Silverquill is a mythic Legendary Creature — Elder Dragon card from Strixhaven: School of Mages Promos (PSTX), collector number 230p. Current market price: $2.33 (foil $3.76), TCGplayer market prices via Scryfall.
Flying, double strike At the beginning of combat on your turn, you may choose two. Each mode must target a different player. • Target player creates a 2/1 white and black Inkling creature token with flying. • Target player draws a card and loses 1 life. • Target player puts a +1/+1 counter on each creature they control.