Sygg, River Guide is a rare Legendary Creature — Merfolk Wizard card from Lorwyn (LRW), collector number 251. Current market price: $1.77 (foil $34.74), TCGplayer market prices via Scryfall.
Islandwalk (This creature can't be blocked as long as defending player controls an Island.) {1}{W}: Target Merfolk you control gains protection from the color of your choice until end of turn.