Can my “take to territory” effect target my opponent’s unique card of which I already have my own copy in my territory? For example, I play the "Remnant" Lost Soul and want to take my opponent's Jonah to my territory, but I already have my own copy of Jonah in my territory. I know that I will not end up with 2 copies of Jonah in my territory, so I'm assuming that I either cannot target my opponent's Jonah in the first place or as soon as the second Jonah hits my territory it is discarded. The question is which one happens?
"Remnant" Lost Soul (PoC): "If put in play, take a hero from Reserve or a character in an opponent's territory to territory until this car leaves play."