Nightwing Volcano

Nightwing volcano enters the battlefield tapped
{t}: add {r}
Erupt {4}
(Nightwing volcano gets a erupt counter)
{t}: add {r}{r}{r}. Activate only if you have two
erupt counters
{1}{t}: Nightwing volcano deals X damage to any
target, Where X is the number of erupt
counters on Nightwing volcano
Is there an earthquake?