Hellkite Hatchling

{r}: Hellkite Hatchling has base power 2/2 and
has flying.
{r}{r}{r}: If Hellkite Hatchling has flying, it has
base power and toughness 5/5 and has trample.
{r}{r}{r}{r}{r}{r}: If Hellkite Hatchling has trample,
it becomes a 7/7 Elder dragon with flying,
trample, and "{r}: Hellkite Hatchling gets +1/+0
until end of turn."