Hero card

Summon: Leviathan

Enchantment Creature – Saga Leviathan

PayoffThe more of what it needs is on the battlefield, the stronger it gets: the deck has to feed it a lot

Needs: Big Mana, Merfolk, Octopus, Serpent, Saga

Gives: Enchantment, Card Draw

Not in winning lists yet: read from the card text and the graph

Build a deck with Summon: Leviathan as the hero

Makes it work

Attuma, Atlantean Warlord · Hydro-Channeler · Prime Speaker Zegana · Campus Composer · Nicanzil, Current Conductor · Benthic Criminologists · Deepfathom Echo · Eclipsed Merrow

Benefits from it

Entity Tracker · Elvish Archivist · Victor, Valgavoth's Seneschal · Erratic Apparition · Scrabbling Skullcrab · Fear of Infinity

Use instead if you don't have it

Summon: Shiva · Ambling Stormshell · Dirgur Island Dragon · Sinuous Benthisaur · Edgar, King of Figaro · Curator of Destinies

Cards in the meta that answer it

Countersculpt (Azorius Control) · Get Lost (Azorius Control) · Inevitable Defeat (4-Color Control) · Bitter Triumph (Dimir Aggro)