Let’s come up with a monster.

His purpose isn't that; he should isolate units from the battle. For example, if you have 3 units against 1, you can leave 10, 30, or even more champions, zombies, unicorns, etc., out of the fight from the very beginning until the end. Of course, this only works if the opponent doesn't have magic like "Remove Obstacles" or "Teleport." :) :)