Foreboding Germinator

Triple-Strike (This creature deals first-strike,
regular, and last-strike combat damage.)
{4}{b}{g}, Exile 13 cards from all graveyards:
Monstrosity 2. (If this creature isn't monstrous, put
two +1/+1 counters on it and it becomes monstrous.)
Foreboding Germinator has +X/+0 as long as it
is dealing last-strike damage where X is its power.