Invasion of Ikoria can Tutor for Vampire Hexmage, which can then be sacrificed to remove all the defense counters from the Battle, which transforms into a massive eight-power Dinosaur that can deal combat damage as though it werent blocked
Glade Watcher + Returned Phalanx + Wishful Merfolk So theres this stream of 2-mana 3/3s or 3/2s that you can pump 1 or 2 mana into to make them attack
Every person on earth except the people who are currently in your game

Chainer Reanimator Chainer, Nightmare Adept | Illustration by Steve Prescott Commander (1) Planeswalkers (2) Liliana, Waker of the Dead Ob Nixilis, the Hate-Twisted Creatures (23) Archfiend of Despair Coffin Queen Crypt Ghast Desecration Demon Dockside Extortionist Dragon Mage Fate Unraveler Fleshbag Marauder Goldspan Dragon Humble Defector Immersturm Predator Kederekt Parasite Kokusho, the Evening Star Maddening Imp Magus of the Wheel Massacre Wurm Rakdos, Lord of Riots Sangromancer Sheoldred, Whispering One Stormfist Crusader Tergrid, God of Fright The Haunt of Hightower Varragoth, Bloodsky Sire Instants (7) Bedevil Rakdos Charm Slaughter Pact Soul Shatter Sudden Spoiling Terminate Tragic Slip Sorceries (15) Damnation Dark Deal Demonic Tutor Dredge the Mire Grim Tutor Incendiary Command Molten Psyche Reforge the Soul Rise of the Dark Realms Scheming Symmetry Torment of Hailfire Toxic Deluge Wheel of Fate Wheel of Misfortune Winds of Change Enchantments (6) Liliana's Caress Megrim Sneak Attack Underworld Breach Underworld Dreams Waste Not Artifacts (11) Arcane Signet Commander's Sphere Fellwar Stone Geth's Grimoire Howling Mine Mana Crypt Memory Jar Mind Stone Sol Ring Talisman of Indulgence Thought Vessel Lands (35) Blightstep Pathway Blood Crypt Bloodstained Mire Bojuka Bog Cabal Coffers Command Tower Dragonskull Summit Exotic Orchard Fabled Passage Graven Cairns Luxury Suite Molten Slagheap Mountain x8 Rocky Tar Pit Smoldering Marsh Sulfurous Springs Swamp x11 Urborg, Tomb of Yawgmoth Yes, Dockside Extortionist is banned in Commander, but I'm trying to retain the decks as they were at the time of writing (you can make updates if you wish)

The amass mechanic is often overlooked because Orcish Bowmasters does so much with its main triggered ability
Temple Bell can be tapped to have each player draw a card , and Kwain, Itinerant Meddler can do the same while also giving everyone a little life gain