Grushnag, Bulwark of Rahl

If you pay more {r} than {g} to cast this card, it enters the battlefield as a 6/4 with haste and first strike.
If you pay more {g} than {r} to cast this card it enters the battlefield as a 4/6 with hexproof and vigilance.
If you pay {r}{r}{r}{g}{g}{g} to cast this card it enters the battlefield as a 6/6 with haste, double strike, hexproof, and vigilance.
{r}: Grushnag, Bulwark of Rahl gains reach until end of turn.
{g}: Grushnag, Bulwark of Rahl gains indestructible until end of turn.
Grushnag, Bu