The leading reason is likely the more powerful graveyard hate, such as Endurance

Sliver Swarm Commander (1) Creatures (43) Crystalline Sliver Winged Sliver Clot Sliver Shifting Sliver Blade Sliver Synapse Sliver Brood Sliver Quick Sliver Crypt Sliver Hibernation Sliver Bonesplitter Sliver Firewake Sliver Gemhide Sliver Harmonic Sliver Might Sliver Two-Headed Sliver Necrotic Sliver Sinew Sliver Bonescythe Sliver Blur Sliver Sentinel Sliver Striking Sliver Megantic Sliver Galerider Sliver Syphon Sliver Manaweft Sliver Constricting Sliver Sliver Hivelord Diffusion Sliver Venom Sliver Lavabelly Sliver Hollowhead Sliver Cloudshredder Sliver Spiteful Sliver Cleaving Sliver Realmwalker Rukarumel, Biologist Capricious Sliver Hatchery Sliver Lazotep Sliver Regal Sliver Taunting Sliver Titan of Littjara Instants (1) Sorceries (10) Windfall Decimate Harsh Mercy Nature's Lore Three Visits Farseek Distant Melody Cultivate Cleansing Nova Crippling Fear Enchantments (1) Artifact (7) Sol Ring Fellwar Stone Vanquisher's Banner Herald's Horn Pillar of Origins Icon of Ancestry Arcane Signet Lands (37) Forest x3 Plains x2 Swamp x2 Mountain x2 Island x2 Rocky Tar Pit Mountain Valley Grasslands Flood Plain Jungle Shrine Savage Lands Seaside Citadel Exotic Orchard Command Tower Nomad Outpost Mystic Sanctuary Sandsteppe Citadel Opulent Palace Frontier Bivouac Prairie Stream Sunken Hollow Smoldering Marsh Cinder Glade Canopy Vista Ash Barrens Irrigated Farmland Sheltered Thicket Scattered Groves Path of Ancestry Unclaimed Territory Secluded Courtyard Commander, Theme, and Strategy The deck title says it all

3,773 Inclusions, 5% of 69,245 Decks) Jodah, the UnifierJodah, the Unifier, at least in regard to The One RingThe One Ring, is no Elsha of the InfiniteElsha of the Infinite, much less a Renari, Merchant of MarvelsRenari, Merchant of Marvels
For this reason, we run Scavenging Ooze and Loaming Shaman
Additionally, Jim Hawkins can move to a new location for free whenever one is played