Zareth San, the Trickster is a rare Legendary Creature — Merfolk Rogue card from Zendikar Rising Promos (PZNR), collector number 242p. Current market price: $0.25 (foil $0.41), TCGplayer market prices via Scryfall.
Flash {2}{U}{B}, Return an unblocked attacking Rogue you control to its owner's hand: Put this card from your hand onto the battlefield tapped and attacking. Whenever Zareth San deals combat damage to a player, you may put target permanent card from that player's graveyard onto the battlefield under your control.