You're trying to get it dead as soon as possible, and a sac outlet like High Market can achieve that at instant speed, which can completely derail an opposing enchantment deck
Throw this into some Mono-White Aggro decks, heck, even in Mono-White Auras, and the power of the deck rises immediately
Whenever equipped creature deals combat damage to a player, create that many 2/2 black Zombie creature tokens
Format: Specify a format to search cards that are legal in that specific one
Attack and exert the Celebrant copy, but dont attack with the original, or at least dont let it die in combat
Anytime a legendary creature you control dies, you get to bring it back as a 2/2 Zombie token copy of that creature, and it loses its legendary status