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.
{U}{B}, {T}: Put X into target opponent's hand.
{3}{U}{B}: You may play a card in the same hand as X without paying its mana cost.
![X [Unstable] | Spectrum Games](http://spectrumgaming.com.au/cdn/shop/products/f77f6e64-2470-4c6a-a92b-328e4edc3ea9.jpg?v=1591956038)
