Sir Gaheris, Stalwart Knight

Vigilance, Firststrike.
If you control another legendary knight, Sir
Gaheris has Deathtouch.
{2}{r}{w} Sacrifice Sir Gaheris: search your library
for an enchantment card, reveal it and put it into
your hand. You may cast it as though it had Flash.
"Treachery will not go unpunished!"