7-cost EustassCaptainKid, 3-cost Roronoa Zoro, 4-cost Trafalgar Law, and 1-cost Nami are the strongest cards in this starter deck, but they can be picked up in other boxes, so you arent forced to buy the ST10 to collect them
Since your core strategy will involve either directly sacrificing rats or using them to block opponents creatures and dying anyway, Voracious Vermin is bound to scale up in strength pretty quickly

Bestial Bloodline Blood Spatter Analysis Bloodghast Bloodline Bidding Blossoming Tortoise Bonebind Orator Brilliance Unleashed Broodheart Engine Builder's Talent Bumi, King of Three Trials Call Damage Control Call a Surprise Witness Carnage, Crimson Chaos Carrion Cruiser Cauldron of Essence Cemetery Recruitment Cheerful Osteomancer Clay-Fired Bricks Coati Scavenger Coiling Rebirth Come Back Wrong Consumed by Greed Convenient Target Corpses of the Lost Corroding Dragonstorm Council of Echoes Curious Cadaver Curious Forager Daily Bugle Reporters Damage Control Crew Daretti, Rocketeer Engineer Dawn-Blessed Pennant Daydream Deadly Brew Deadly Plot Deathless Pilot Decoy Ploy Defiled Crypt // Cadaver Lab Defiled Crypt // Cadaver Lab Defossilize Desecrex, Gift of Servitude Dewdrop Cure Dire Flail Divergent Equation Does Machines Dose of Dawnglow Driver of the Dead Dundoolin Weaver Dune Drifter Dutiful Griffin Eddie Brock
The best reason to play is that the developers of Yu-Gi-Oh
Monsters and spells too
A lot of the time this is gonna hit your deck hard too, but if you build around it, it can be devastating