Triple Headed Colossal

As an additional cost to cast this creature, sacrifice 3 creatures
Menace, Flying, Intimidate, Acid Blood 4, Doublestrike
This creature can block 2 additional creatures each combat
{b}{b}{b}: Untap this creature (this ability can only be activated 2 times each turn)
{t}{p/w}{p/u}{p/r}{p/g}{p/g}{p/r}{p/u}{p/w}: Deal 6 damage to 3 target creatures; or deal 3 damage to 3 players or planeswalkers