Add in Archon of Cruelty, Iona, Shield of Emeria, and some newer additions like Summon: Bahamut, and youve got plenty of creatures that can win games almost singlehandedly

Scientists Abzan Monument Agency Outfitter Alabaster Host Intercessor Alpine Guide Alpine Houndmaster Ambitious Farmhand Angel of the Ruins Angel's Herald Angrath's Fury Ashiok's Forerunner Asmoranomardicadaistinaculdacar Ayara's Oathsworn Battle Plan Beamsaw Prospector Bebop, Warthog Warrior Bedhead Beastie Bitterheart Witch Blood Speaker Boggart Harbinger Borough Backup Brainspoil Bribery Call the Mountain Chocobo Campus Guide Canyon Crawler Case of the Shattered Pact Case of the Stashed Skeleton Chandra's Firemaw Chandra's Flame Wave Changeling Wayfinder Citanul Flute Claim Jumper Cloudbound Moogle Compass Gnome Conduit of Ruin Corpse Connoisseur Coveted Prize Cragsmasher Yeti Cynical Loner Dauntless Scrapbot Defiant Vanguard Demon's Herald Diabolic Intent Dimir House Guard Dimir Infiltrator Disciple of Deceit Dizzy Spell Dovin's Dismissal Dragon's Approach Dragon's Herald Drift of Phantasms Dune Mover Eagles of the North Ecologist's Terrarium Elspeth's Devotee Embermouth Sentinel Embodiment of Spring Emeritus of Woe Escape Tunnel Eternal Dominion Ethereal Usher Everything Pizza Faerie Harbinger Farfinder Fiery Fall Fighter Class Fleshwrither Forerunner of the Coalition Forerunner of the Empire Forerunner of the Legion

Kastral, the Windcrested Kastral, the Windcrested is how WotC does straightforward commanders these days
Over 9000
If you have another creature with power two or less with an enter ability you want looping, Reveillark's ability allows it to return up to two creatures
There are likely plenty of other combos worth considering, and Alistair looks like a fun and powerful build-around Commander