Nice to know it can only be used if your opponent has your monster card...so who's the genius that did not put that HUGE GAME CHANGING DETAIL ON THE DAMN CARD?!
the first word on the card description is RETURN.
RETURN - verb (used without object)
1.
to go or COME BACK, as to a former place, position, or state.
So if it has to come back, you have to lose it in the first place. So yeah, there's your lesson.
So if your opponent controls your monster you can take it back and vice versa. So use Lava golem, destroy two of your opponents monsters and then take Lava Golem ba