This obviously works well when it comes to crewing Vehicles, but this will be sought after by many decks that utilize mana dorks, or even Persistent Petitioners decks
For 6 mana, Muxus lets you reveal the top six cards of your library and put all goblins with mana value 5 or less onto the battlefield, often flooding the board with a horde of creatures
When I play aggressive creature based strategies nowadays, I always want to max-out on creatures so that Im not out of gas after a boardwipe
Simply put: anything which lets you avoid paying mana for effects you normally spend mana on is extremely powerful

Table of Contents show The Deck Panharmonicon | Illustration by Volkan Baga Commander (1) Planeswalker (1) Creatures (36) Antler Skulkin Bloodline Pretender Changeling Outcast Crossroads Candleguide Elesh Norn, Mother of Machines Etherium Sculptor Fang Skulkin Farmstead Gleaner Foundry Inspector Heap Doll Hoof Skulkin Irregular Cohort Jawbone Skulkin Jousting Dummy Mirror Entity One-Eyed Scarecrow Padeem, Consul of Innovation Pili-Pala Rattleblaze Scarecrow Realmwalker Scarecrone Scaretiller Scorn Effigy Scrapbasket Scuttlemutt Shell Skulkin Spark Double Taurean Mauler Thassa, Deep-Dwelling Transplant Theorist Universal Automaton Unsettled Mariner Watchwing Scarecrow Wild-Field Scarecrow Wingrattle Scarecrow Yarok, the Desecrated Instants (6) Cyclonic Rift Eerie Interlude Ghostly Flicker Heroic Intervention Lae'zel's Acrobatics Semester's End Sorceries (7) Collective Voyage Cultivate Farewell Farseek Nature's Lore One with the Machine Rampant Growth Enchantments (4) Cryptolith Rite Kindred Discovery Reflections of Littjara Smothering Tithe Artifacts (9) Arcane Signet Chromatic Lantern Chromatic Orrery Coat of Arms Lightning Greaves Panharmonicon Shadowspear Sol Ring Timeless Lotus Lands (34) Academy Ruins Cascading Cataracts Command Tower Exotic Orchard Flooded Strand Forest x4 Godless Shrine Hallowed Fountain Indatha Triome Island x3 Ketria Triome Mana Confluence Marsh Flats Mountain x2 Overgrown Tomb Path of Ancestry Plains x4 Spara's Headquarters Swamp x3 Temple Garden The World Tree Wooded Foothills Zagoth Triome There are two main ways to build a Reaper King deck

How Magic is Different Magic is Different I firmly believe Magic the Gathering is a unique gaming environment in that sexism and misogyny are not endemic to the game itself