Eldritch Hydra

{u}{t}: all blue creatures on the battlefield get a +6/+12 until end of turn
{b}{t}: all black creatures on the battlefield get a +6/+12 until end of turn
{r}{t}: all black creatures on the battlefield get a +6/+12 until end of turn
{1}{ut}
{b}: Exile target opponents creature
{r}: Deal 7 damage divided among creatures or players
{u}: Add a -7/-7 and 5 poison counters to the game