Shivan Cultist

{r} Shivan Cultist gets +1/+0 until end of turn
{r}{r}{r}{r}{r} Sacrifice Shivan Cultist. Play Shivan Dragon from your library, graveyard, or exile.
{t} You may sacrifice {x} of Shivan Cultist's power
to give power up Shivan Dragon.
Shivan Dragon gets +1/+1
{r}{r}{r} Destroy Shivan Cultist and give +5/+0 to Shivan Dragon