The end result is an effective blend of old and new-school Magic, clearly capable of taking on the tyrants of the current metagame
The different options for us to splurge on a nice present for our opponents are: An 8/8 Octopus A card A Treasure A tapped 1/1 Fish A Food An Extra Turn (!) And finally, Living Death Jokes aside, lets order these into a rough hierarchy of what is bad to give your opponent

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

OLD GNAWBONE Old Gnawbone is infamous for causing a lot of discourse
Yes, they are hard to cast, but two of them are clearly the best, with the other three still being good but not game-breakers the same way
This card gets you a good deal of the way to a Maze's End victory