Staraptor

You may sacrifice a creature named Staravia
rather than pay this spells mana cost.
Flying, protection from Spirits.
Whenever Staraptor attacks or blocks, opponents'
creatures get -1/-0 until end of turn.
Whenever Staraptor attacks alone, it gets +2/+0
until end of turn. {p/c}: Staraptor gets +2/-1 until end of turn.
{t}: Staraptor fights target creature you don't
control. (Each deals damage equal to its power to
the other.)