Eni, Scourer of Tomes

Eni, Scourer of Tomes gets +3/+3 and has
hexproof as long as a graveyard has fifteen or
more cards in it.
{x}{u}: Look at the top X cards of your library.
Put any number of them into your graveyard,
then out the rest back in any order.
{x}{x}{b}: Each opponent discards X cards. You
lose X life.