Erthink, Vainglorious King

{g}: Untap another target permanent. Activate
this ability only once each turn.
{1}{w}: Erthink gains protection from the color of
your choice until end of turn.
{2}{u}: Exile the top card of your library. Then,
you may cast an instant card exiled with Erthink.
{3}{b}: Each opponent sacrifices a permanent.
{4}{r}: Erthink deals damage to each opponent
equal to the number of cards in that player's
hand.