Other enchantment creatures you control have menace.
Whenever Anikthea enters or attacks, exile up to one target non-Aura enchantment card from your graveyard. Create a token that's a copy of that card, except it's a 3/3 black Zombie creature in addition to its other types.
Fill your graveyard with powerful enchantments, then use Anikthea's enter/attack triggers to repeatedly reanimate them as 3/3 Zombie enchantment creature copies. Each trigger snowballs value and a wide, menacing board, and because the copies are enchantment creatures they all gain menace and feed your enchantress engines. You grind opponents out with overwhelming card advantage and beat down with an evasive token army.
Repeatable, hard-to-interact value engine that turns dead enchantments into 3/3 bodies every combat
Reanimates from graveyard so it dodges much creature removal and benefits from self-mill
Excellent in Abzan colors with deep enchantress and recursion support
Token copies are full enchantment creatures, triggering constellation, enchantress, and sacrifice payoffs
Built-in menace plus team menace makes blocking and stax hard to assemble against you