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I don't remember having any difficulties with the hero from the Rampart; I just checked, and the resurrection was already in place for the fight against him.
The hero with Magog and Hydra can be defeated using the main strategy: a stack of harpies + 1 harpy. The harpies are placed in front of the blinded Hydras, so the Magogs don't shoot. As the number of Magogs in the stack decreases, they may change their minds and start shooting, so we switch to the "attack - blindness" tactic.
The hero with magical elementals can be killed with black dragons and a small, fast-moving unit. You can remove two retaliators, but it's best to take a faster unit than the one I used. For example, griffins.