Cull Obsidian

Trample, Deathtouch
All creatures you control have trample and +1/+1.
{5}{b}{g}{b/g}: Monstrosity 5. (If this creature isn't monstrous, put 5 +1/+1 counters on it and it becomes monstrous.)
{b}{b}{g}{g}{b/g}: Cull Obsidian gains indestructible until end of turn.