You could build the deck around just one, but a mixture of a few will make your deck stand up better against different commander players
The price was $89.99 when it first debuted, but you can grab it now for $49 at the warehouse and make it part of your decor for Halloween each year
In these decks, Shardless Agent enables an easy two-card combo with either Living End or Crashing Footfalls, making those lists very consistent and powerful strategies and the best combo decks in the format
Chaos Core X DARK Level 3 [ FiendEffect ] ATK 0 DEF 0 When either player activates a card or effect that targets this card, or when your opponent's monster targets it for an attack (Quick Effect): You can send up to 1 each of "Uria, Lord of Searing Flames", "Hamon, Lord of Striking Thunder", and "Raviel, Lord of Phantasms" from your hand and/or Deck to the GY, and if you do, place 1 Phantasm Counter on this card for each card sent to the GY, and if you place at least 1, you take no battle damage this turn
If you do want to stick with the madness theme, considering heading toward Vampires, playing Falkenrath Gorger, and trying to loot your graveyard full of tribe members to reanimate with something like Living Death