Dominaria

Sentinel of the Pearl Trident | Creature | Merfolk Soldier | Flash When Sentinel of the Pearl Trident enters the battlefield, you may exile target historic permanent you control. If you do, return that card to the battlefield under its owner's control at the beginning of the next end step. (Artifacts, legendaries, and Sagas are historic.) | Jonas De Ro

Weight of Memory | Sorcery | | Draw three cards. Target player mills three cards. | Eric Deschamps

Tatyova, Benthic Druid | Legendary Creature | Merfolk Druid | Landfall — Whenever a land enters the battlefield under your control, you gain 1 life and draw a card. | Mathias Kollros