New to EDH, looking for suggestions for Merfolk Tribal deck

[Aureliaven]

This deck tries to go wide with Merfolk creatures and has emphasis on untapping or tapping them for additional effects, or buffing them with +1/+1 lords or +1/+1 counters. The board is protected by counterspells or hexproof effects. Any card suggestions are appreciated, as this is my first time building an EDH deck for myself.

https://deckstats.net/decks/113709/1071207-ocean-s-tyrant

[Firegriff]

With an almost pure merfolk presence, definitely have Metallic Mimic and/or Adaptive Automaton.  The mimic means everything will come in benefitting from Herald of Secret Streams.  Blossoming Defense might work.

[arnauoso]

I think Kindred discovery is better than Seafloor Oracle