
You have no maximum hand size. At the beginning of your upkeep, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.") Whenever you draw your second card each turn, put two +1/+1 counters on Morska.
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Pulled from EDHREC — cards most often included with Morska, Undersea Sleuth.

Academy Manufactor
High Synergy Cards

Tireless Tracker
High Synergy Cards

Erdwal Illuminator
High Synergy Cards

Tangletrove Kelp
High Synergy Cards

Detective of the Month
High Synergy Cards

Lonis, Cryptozoologist
High Synergy Cards

Adrix and Nev, Twincasters
High Synergy Cards

Inspiring Statuary
High Synergy Cards

Teferi's Ageless Insight
High Synergy Cards

Ethereal Investigator
High Synergy Cards

Merchant of Truth
Top Cards

Kappa Cannoneer
Top Cards

Idol of Oblivion
Top Cards

Mechanized Production
Top Cards

Bennie Bracks, Zoologist
Top Cards

Tezzeret, Betrayer of Flesh
Top Cards

Disorder in the Court
Top Cards

Junk Winder
Creatures

Alandra, Sky Dreamer
Creatures

On the Trail
Top Cards

Shimmer Dragon
Creatures

Tamiyo's Journal
Utility Artifacts

Wilderness Reclamation
Enchantments

Jolrael, Mwonvuli Recluse
Top Cards

Forensic Gadgeteer
Creatures

Spire of Industry
Lands

Ulvenwald Mysteries
Enchantments

Ongoing Investigation
Enchantments

Talisman of Curiosity
Mana Artifacts

Search the Premises
Enchantments