Onderzeeboot
Ecstatic Orb
I think Conrol Magic is fine in standard, depending on the available answers. Something like Flickerwisp and good etb creatures would go a long way towards making it just good value. Mind Control (i.e. the card that shows that this effect should cost five mana nowadays) is an uncommon that is completely unplayable in constructed. I don't believe for a minute that shaving off one mana off Mind Control creates a card that is broken in Standard.