The waters that give the River Herald merfolk their name are sacred to their culture; they do not abide invaders to sail upon them.

River's Rebuke

Return all nonland permanents target player controls to their owner's hand.

Foundations

Carefully following the thaumatic compass Bolas had given her, Vraska blundered straight into the River Heralds' trap.

New Capenna Commander

Game Night 2019

Ixalan Promos

There are many important moments in the story, but the most crucial—called "story spotlights"—are shown on cards. These cards have the Planeswalker symbol in their text box; this symbol has no effect on gameplay. You can read more about these events in the official Magic fiction at http://www.mtgstory.com.