The tempo play puts the player casting it well ahead, but the restrictions of legendary sorceries makes this a build-around rather than a straight value card
While the future of the cycle is clouded by the fact that the enchantments are unique, which in turn makes them hard to analyze since we are lacking historical context, here's where I am right now in terms of Saga playability by format
Some of the earlier support cards Royal Tribute, Charm of Shabti, Rite of Spirit are neither Gravekeeper's nor Necrovalley cards, yet remain connected to the archetype
Wigglytuff can be obtained from Genetic Apex: Pikachu pack in the Genetic Apex set
The number of PSA 10 versions of this card in circulation is immediately comparable to the near-mythical Base Set Shadowless Charizard
Gem-Knight has several cards that were designed for going second such as Gem-Knight Quartz directly setting a "Fusion" Continuous Spell ( Scatter Fusion or Brilliant Fusion), giving you reliable access to these powerhouses