Edison format ruling
Enemy Controller

Card text as printed in this era① Choose 1;
● Target 1 face-up monster your opponent controls;
change that target's battle position.
● Tribute 1 monster, then target 1 face-up monster your opponent controls;
until the End Phase, take control of that target.
Rulings
- If the monster isn't face-up in its owner's control when this resolves, nothing happens to it.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.