Emissary of Dragon

Emissary of Dragon cannot be cast from your
hand or from the command zone.
Once during your turn you may reveal Emissary
of Dragon from your hand, lose 5 Life and choose
one: search your library for a dragon card and put
it into play, or deal 5 damage to any one target.
If Emissary of Dragon attacks, opponent's
creatures get -5/-5 and your creatures get +5/+5
until end of turn.