Warren Soultrade and Gravecrawler (another card you'll find later in this list), for example, lets you bestow infinite life loss to every opponent
Both Lier, Disciple of the Drowned and Storm-Kiln Artist more than hold their own, too, commonly appearing in Commander Spellslinger decks
Warp World: With a lot of tokens, you can reset the board with all your creatures, artifacts, lands, and enchantments (minus your graveyard and exile zones) out on the battlefield
These decks are commonly represented to be casual-focused decks that are promoting a wacky strategy that is more about doing the thing, and less about winning the game. Many of the social taboos in casual Commander games are listed here as forbidden things that should not be available in your decks
He'll obviously love Black for Buried Alive and self-mill stuff and Zombify effects and then White for Karmic Guide, Green for Eternal Witness and self-mill too and loads more