Was this half of the crown found near the Ursula final battle, and who hypnotized Basil
Then each player who didn't discard a creature card this way loses 4 life
It requires a few changes to help along the mill strategy like Maddening Cacophony, Mind Grind, and Tashas Hideous Laughter
This is the "vanilla" decklist: Rebuilding the deck is basically the usual process - remove ETB tapped lands, substitute in "better" aka typed duals, more basics (yes more, most precons have unnecessary non-basic duals, and then run cards like Kodama's Reach and Fertilid, such that they can quite easily run out of basics to search for.) Focus on the core aspects or the deck - getting +1/+1 counters out on small creatures and spreading them around, then leveraging the growth in +1/+1 counters via varied abilities to turn small creatures into big fatties
(2023-07-28) Your commander's creature types are checked immediately after you cast a creature spell spending mana from Path of Ancestry's last ability
Kalamax will build up quickly into a game winning machine unlike many of these and get a Commander Damage kill pretty quickly unlike many of these effects