Play against Necropolis.

And ask Father Sky and Mother Earth to ensure that the Necropolis doesn't have any foreign secondary units for the converter, 2 artifacts from its own set (otherwise -1 speed and it won't reach its destination), and Subjugation.

The Cyclops has a speed of 6 + tactics + speed aura + boots... who won't it reach? As for your converter, it won't be saved from the Cyclops when they walk through every two Necromancer units under Wrath, pushed by two squads of Chieftains and a hero, and with acceleration... The Necromancer's strength lies in darkness in this case. You can't simply overwhelm the Orc with bones...