Basically, they make it so that both spells and abilities that your opponents control cost an extra two mana to cast or activate if they target a Merfolk you control
Next on the list might be casual players who actually want to build decks around the cards, but I'm not sure how often this happens
Sometimes, youll focus heavily on your lands and get a huge mana discount on spells

The Decklist Lorehold Spirit | Commander | Wizards of the Coast Commander (1) 1 Quintorius, History Chaser Creatures (36) 1 Angel of Indemnity 1 Anger 1 Ao, the Dawn Sky 1 Atsushi, the Blazing Sky 1 Augusta, Order Returned 1 Balefire Liege 1 Claim Jumper 1 Conspiracy Theorist 1 Containment Construct 1 Drumbellower 1 Excava, the Risen Past 1 Guardian of Faith 1 Guardian Scalelord 1 Hofri Ghostforge 1 Kami of Ancient Law 1 Karmic Guide 1 Kirol, History Buff 1 Laelia, the Blade Reforged 1 Lorehold Archivist 1 Millikin 1 Moonshaker Cavalry 1 Naktamun Lorespinner 1 Quintorius, Field Historian 1 Quintorius, Loremaster 1 Relic Retriever 1 Remorseful Cleric 1 Selfless Spirit 1 Serra Paragon 1 Skyclave Apparition 1 Spirit of Resilience 1 Squee, Goblin Nabob 1 Sun Titan 1 Teshar, Ancestor's Apostle 1 Vanguard of the Restless 1 Venerable Warsinger 1 White Orchid Phantom Instants (3) 1 Lorehold Charm 1 Path to Exile 1 Swords to Plowshares Sorceries (9) 1 Ceaseless Conflict 1 Faithless Looting 1 Fateful Tempest 1 Rip Apart 1 Secret Rendezvous 1 Seize the Spoils 1 Sevinne's Reclamation 1 Tragic Arrogance 1 Wave of Reckoning Enchantments (4) 1 Advanced Reconstruction 1 Monologue Tax 1 Primary Research 1 Tocasia's Welcome Artifacts (10) 1 Arcane Signet 1 Archaeomancer's Map 1 Bitterthorn, Nissa's Animus 1 Currency Converter 1 Fellwar Stone 1 Mind Stone 1 Patchwork Banner 1 Perpetual Timepiece 1 Sol Ring 1 Staff of the Storyteller Lands (37) 11 Plains 6 Mountain 1 Battlefield Forge 1 Clifftop Retreat 1 Command Tower 1 Emeria, the Sky Ruin 1 Exotic Orchard 1 Fabled Passage 1 Fields of Strife 1 Furycalm Snarl 1 Glittering Massif 1 Lorehold Campus 1 Lotus Field 1 Mistveil Plains 1 Radiant Summit 1 Rugged Prairie 1 Sacred Peaks 1 Study Hall 1 Sunscorched Divide 1 Temple of Triumph 1 Terramorphic Expanse 1 Turbulent Steppe Conclusion The Lorehold Spirit deck has both old tech and new tech worth picking up
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