Sorry if this first one was mentioned before, but searching for 'command' brought up 20 pages of posts.
Command is supposed to allow your unit to force a unit to take a turn immediately, but what it's done for me is to allow the casting unit unlimited turns. This is a nice way to cheese out a victory over a powerful opponent, but obviously not working as intended.
Berserk also makes the unit take another turn immediately, but then they seem to go out of circulation for at least one round. Am I just imagining things?