Cruel Reflection

When Cruel Reflection enters the battlefield,
search target opponent's library for a creature
card at random and exile it. Then, they shuffle.
{x}, Pay X life, Sacrifice Cruel Reflection: Put a creature card with mana value equal to X exiled
with Cruel Reflection onto the battlefield under
your control. It gains haste. Shuffle it into its
owner's library at the end of combat. Activate
only at beginning of combat on your turn.