one piece booster box 12 TCG: Legacy Of The Master [OP-12] (24CT) Set sail on an epic adventure with the One Piece Card Game One Piece Legacy of the

A similar line of cards came with the release of Strixhaven in April 2021: the Mystical Archive, and it returned with the Secrets of Strixhaven Mystical Archive

It was a playset in Standard back in the day and it sees play in Voltron Commander decks too

Sahagin 1U Creature : Merfolk Warrior Whenever you cast a non-creature spell, if at least 4 mana was spent to cast it, put a +1/+1 counter on this creature and it cant be blocked this turn

Her ability triggers when any player loses life (you included), so you if you cast Norn's Annex by paying plus 4 life, she'll trigger her card-draw ability on your end step (on top of triggering her last ability when you cast it)