You draw no more cards.
Thassa, Deep-Dwelling wont help protect any of your creatures like your instants will, but it allows you to flicker a scarecrow for free each turn

Scientists Abandon Attachments Action News Crew Adventurer's Airship Agna Qel'a Agonasaur Rex Airship Crash Alpharael, Dreaming Acolyte Alpharael, Stonechosen Altanak, the Thrice-Called Ancestral Reminiscence Anthropede April, Reporter of the Weird Artist's Talent Ashling, Rekindled Avishkar Raceway Awaken the Honored Dead Balamb T-Rexaur Balin, Loremaster Bandit's Talent Bard's Company Baron Strucker, HYDRA Overlord Basri, Tomorrow's Champion Bebop & Rocksteady Bebop, Warthog Warrior Bedhead Beastie Bellowing Crier Bilbo, Luckwearer Binding Negotiation Bitter Triumph Bloodthorn Flail Boosted Sloop Borough Backup Borrowed Knowledge Boundary Lands Ranger Bramble Familiar Brass's Tunnel-Grinder Broadside Barrage Bullseye, Death Dealer Byway Barterer Calamitous Tide Caldaia Brawlers Cam and Farrik, Havoc Duo Canyon Crab Canyon Crawler Capital City Captain Howler, Sea Scourge Carlo, Suave Schemer Case of the Crimson Pulse Casey Jones, Vigilante Celebrate the Mountain-king Chandra, Spark Hunter Charging Strifeknight Charming Scoundrel Chart a Course Chitin Gravestalker Cid, Timeless Artificer Clamorous Ironclad Clive, Ifrit's Dominant Cloudbound Moogle Collector's Vault Colossus of the Blood Age Confusticate and Bebother Connecting the Dots Cool but Rude Crash, Reckless Endrider Cryptcaller Chariot Daggermaw Megalodon Data Scrubber Demand Answers Detention Chariot Discerning Peddler

Call it an early Halloween treat before the spooks of All Hallows Eve
This was what Mewtwo LV.X did, and while it had only one goal, it was clearly built for that purpose