Thunderous, Keranos's Pet

Flying (This creature can't be blocked except by creatures with flying or reach.)
{3}{u}{r}, {t}: Scry 1, then reveal the top card of
your library. Thunderous, Keranos's Pet deals X
damage to X other creatures target at random,
where X is that card's converted mana cost. Tap
each creature dealt damage this way. (To scry 1,
look at the top card of your library, then you may put
that card on the bottom of your library.)