Jade Seedstones [The Lost Caverns of Ixalan]

When Jade Seedstones enters the battlefield, distribute three +1/+1 counters among one, two, or three target creatures you control.

Craft with creature 5GG (5GG, Exile this artifact, Exile a creature you control or a creature card from your graveyard: Return this card transformed under its owner’s control. Craft only as a sorcery.)

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Jadeheart Attendant

When Jadeheart Attendant enters the battlefield, you gain life equal to the mana value of the exiled card used to craft it.

When the merfolk fled underground, they brought the life force of the jungle with them.