Garath, Bringer der Flammen

When you cast Garath, Bringer of Flames, you may pay X life. Garath costs half X less to cast.
Flying, Haste, Trample, Double Strike, Menace, Vigilance
Whenever Garath attacks you may pay {p/r}{p/r}{p/r}. If you do other attacking Creatures are getting +3/+3.