Marinna, Master of the Enrai

Swampwalk, forestwalk, islandwalk, hexproof
Black creatures you control have swampwalk, green creatures you control have forestwalk, and blue creatures you control have islandwalk.
{2}{b}{g}{u}, {t}: Target land is every basic land type until the next end step.
She guides the great river Enrai towards Anavilia's crystalline heart.