Destva, Dice's Law

X: Shuffle all player's libraries, draw a card and reveal it : gain X loyalty based on the number of colors in the mana cost of this card.
-X: shuffle all player's libraries, draw a card and reveal it : discard X cards from target opponent's hand (X the number of colors in the mana cost)
-10: Draw a card. deal 2*X damage to an opponent and all the creatures he controls, with X the number of colors in the mana cost of the card you drew.