Dahria, Temple Detective

Anytime a player discards a card from a source
other than this card, untap this card.
{t},{1}{u/b}{u/b}; Surveil 3.
{t},{2}{u/b}{u/b}; Target player places the top 3 cards
of their library into the graveyard.
{6}{u/b}{u/b}; Exile target Instant, Sorcery, or Artifact
card from a graveyard. Until end of turn, you
may play this card without paying its mana cost.
Dahria, Temple Detective's Power is equal to the number of Artifacts you control.