The Royal Scions is a mythic Legendary Planeswalker — Will Rowan card from Secret Lair Drop (SLD), collector number 1600. Current market price: $3.52, TCGplayer market prices via Scryfall.
+1: Draw a card, then discard a card. +1: Target creature gets +2/+0 and gains first strike and trample until end of turn. −8: Draw four cards. When you do, The Royal Scions deals damage to any target equal to the number of cards in your hand.