Ixalan

Jungle Delver | Creature | Merfolk Warrior | {3}{G}: Put a +1/+1 counter on Jungle Delver. | Kieran Yanner

Kumena's Speaker | Creature | Merfolk Shaman | Kumena's Speaker gets +1/+1 as long as you control another Merfolk or an Island. | Johann Bodin

Old-Growth Dryads | Creature | Dryad | When Old-Growth Dryads enters the battlefield, each opponent may search their library for a basic land card, put it onto the battlefield tapped, then shuffle. | Yongjae Choi