mtg zodiac cards Zodiac Ox - Portal Three Kingdoms - Magic: The Gathering

The Outlaws of Thunder Junction Grand Larceny Commander Deck includes 1 Black-Green-Blue deck of 100 Magic cards (2 Traditional Foil Legendary cards, 98 nonfoil cards), a 2-card Collector Booster Sample Pack (contains 1 Traditional Foil or nonfoil alt-border card of rarity Rare or higher and 1 Traditional Foil Borderless Uncommon card), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 Life Wheel, 1 strategy insert, and 1 reference card

I'm after some explanation on the rules returning a card to the owner's hand the question was raised by Darking Merfolk Consider the scenario where I have Darting Merfolk in play My opponent play...

Carnage Tyrant

Enchanted creature is 1/1.)