The troop that cast Betrayal would make the troop turn on their team mates even the hero forever and would keep attacking them until they all died then that troop would also die. Like Charm but last forever. And that troop would be linked to the caster like mind control, the only way to stop the betrayal effect the opponent would have to kill the troop that casted the betrayal spell thus killing the troop too. And have the troop that was affected by the spell betrayal their eyes would turn red. What you’ll think? 
I posted similar thing in my custom mythic discord channel back in October 23 “Malaki”
New Game Mechanic: Control means that the targeted troop will be your troop as the fifth one (it will still stay in the enemy lineup) taking up from his mana generation but can only be cast by the controller. The effect is cancelled once the troop gets cleansed or Malaki dies. Also, you can’t control the last troop (One troop left).
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I playing on xbox series version, i looked and don’t have that troop. Looks awesome! I wish we all could use those troops.