rage of the abyss booster box YUGIOH Sea Serpent YuGiOh! Rage Of The Abyss

If you're looking for high-synergy cards for the 99, then you'll have a blast browsing EDHREC dedicated Merfolk page

Banlist History Restriction changes recorded for Infernoid Attondel

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Others still, opt for an Abyss Soldier package, noting the synergy it has with Toon Mermaid (searched for with Table of Contents) and Salvage

If Stormsplitter splits er, leaves the battlefield before its triggered ability resolves, the token will still enter as a copy of Stormsplitter, using Stormsplitter's copiable values from when it was last on the battlefield