You have loads of ways to trigger this in the Necrons deck itself, particularly all of the cards that have unearth, but youll find even more ways to do this in a dedicated deck
Azorious colors give it a wide variety of tools to protect it, and cards like Lightning Greaves can help it to swing on the same turn it enters the battlefield
Facilier, Charlatan 3x Magic Broom, Bucket Brigade 3x Minnie Mouse, Beloved Princess 2x Yzma, Alchemist Cost 3 Cards 3x Friends On The Other Side 2x Maleficent, Sorceress 2x Maximus, Relentless Pursuer 3x Mickey Mouse, True Friend 1x Part Of Your World 3x Rafiki, Mysterious Sage 3x The Wardrobe, Belle's Confidant Cost 4 Cards 2x Ariel, On Human Legs 2x Cinderella, Gentle and Kind 1x Hades, Lord of the Underworld 2x Hakuna Matata 2x Jafar, Wicked Sorcerer 2x Jetsam, Ursula's Spy 1x Mickey Mouse, Wayward Sorcerer - Foiled Cost 5 Cards 1x Flotsam, Ursula's Spy 1x Moana, Of Motunui - Foiled Cost 6 Cards 1x Sven, Official Ice Deliverer Cost 7 Cards 1x Dr
In my opinion, there arent enough good reasons to keep playing Conflagrate
The precon list already has a few notable and powerful pingers, but its missing quite a few potent ones