Merlwyb, Sea's Command

Flash, first strike
{1}{u}, {t}: Look at the top three cards of your
library. Put one into your hand and the rest into
your graveyard.
{2}{b}: Merlwyb, Sea's Command gains deathtouch
until end of turn.
Whenever you cast a spell during an opponent's
turn, untap Merlwyb, Sea's Command.