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Slow and Vampires in the corner. A constant battle is waged only with two stacks of Griffons (if not fewer). A retaliatory strike combined with an ability is a serious argument.
The chance of Conservatory appearing is higher than the chance of Utopia appearing.
Phoenixes are not much better than Spectral Dragons, but the opponent will have at least twice as many:))).
Fairies, together with Phoenixes, will be very appealing to your Vampire Lords; they will become friends.
Elementals will move first. But if the Phoenixes fly up in a friendly manner, the skeletons can talk to them. In their own language. Taking into account the number.
Death Knights are a serious argument, but the problem is that the opponent will have approximately the same number of Phoenixes, or even more.
With a full army, the opponent may have two units of archers. This is not good, however, Elementals are vulnerable to various types of magic.
Angels can play a little better for Necropolis than for Elementals, due to the hero likely having higher stats.
In terms of magic for Necropolis in this battle, in addition to Slow, Haste, and powerful damage spells, naturally, Raise Dead and Teleport will also be good. Unexpectedly teleported skeletons can deprive the opponent of, for example, Phoenixes.
Regarding revivals. After killing the Phoenixes, don't forget to stand on their corpses with your unit. Otherwise, they may start to be revived.
Remember that with an equal amount of mana and magic power (and also with an equal level of Earth magic), the one with Raise Dead usually wins against the one with Revive - less mana is needed.
Tantus can learn Raise Dead.