Selora, Goddess of Lies

Whenever an opponent searches their library,
deal 5 damage to that opponent and search your
library in the same way.
Sacrifice an island or swamp: You may tap
islands and swamps your opponents control for
mana this turn.
{x}{x}{u/b}, {t}: Search your library or graveyard for
a card with converted mana cost X or less.
Shuffle.