Using Mob grinding utilities, I obtained an enderman spawn egg to change a cave spider spawner into an enderman spawner. I used the moving wand in survival with the experience being used instead of power, and after one enderman spawned, it changed back to cave spider. Is repeatable.
FTB Revelation 1.2.0 Minecraft Forge 14.23.1.2573 not enough wands 1.12 1.6.0 mob_grinding_utils 0.3.4
Using Mob grinding utilities, I obtained an enderman spawn egg to change a cave spider spawner into an enderman spawner. I used the moving wand in survival with the experience being used instead of power, and after one enderman spawned, it changed back to cave spider. Is repeatable.