UU - Black Hole

Card Texts

C&C Print Second Edition: If this card is in your Stable at the beginning of your turn, SACRIFICE a Magical Unicorn card, then Search the deck for a Basic Unicorn card and bring it into your Stable. Shuffle the deck.
C&C Print: If this card is in your Stable at the beginning of your turn, SACRIFICE a Magical Unicorn card. Search the deck for a Basic Unicorn card and bring it directly into your Stable. Shuffle the deck.

This card has no requirement effect text that prevents playing the card.
You still search the deck for a Basic Unicorn card and put it directly your Stable, even if you were unable to sacrifice a Magical Unicorn.