The ability doesn’t target any creature. You choose which one to return when the ability resolves. No player can respond to this choice once the ability starts resolving.
01-07-2012
wotc
Roaring Primadox’s ability is mandatory. When it resolves, if Roaring Primadox is the only creature you control, you must return it to its owner’s hand.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.