As long as X is in X's owner's opponent's hand, X's owner may cast X and activate X's abilities. That opponent can't cast X and plays with their hand revealed.
UB, T: Put X into target opponent's hand.
3UB: You may play a land or cast a spell from the hand X is in. If you cast a spell this way, you cast it without paying its mana cost.
You play the card as X’s last ability resolves, with one exception: You can’t play a land this way unless it’s your turn and you have an available land play. If you’re casting a spell this way, you do so as the ability resolves. Ignore any timing restrictions based on the card’s type. You can cast their sorceries or creatures during their turn, for example.
2018-01-19
wotc
You don’t own the cards you play this way. An instant or sorcery cast this way will go to its owner’s graveyard. A creature card you cast this way will enter the battlefield under your control, but it will be put into its owner’s graveyard if it dies. The same is true for other permanent cards you cast or lands you play.
2018-01-19
wotc
You choose which card to play as X’s last ability resolves. Your opponent can respond to you activating the ability to get other cards out of their hand. Whatever’s left when the ability resolves is fair game.
2018-01-19
wotc
You activate X’s first activated ability while X is on the battlefield under your control. This puts X into an opponent’s hand. That opponent plays with their hand revealed, and they’re not allowed to cast X or activate any of X’s abilities—but you are. You can activate X’s second ability to play one of the cards in that hand.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Not Legal
Legacy
Not Legal
Pauper
Not Legal
Vintage
Not Legal
Penny
Not Legal
Commander
Not Legal
Oathbreaker
Not Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Not Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Not Legal
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