Rider of the Hollow

When Rider of the Hollow enters the battlefield
or at the beginning of your upkeep, if it has no
pumpkin counters on it, put a pumpkin counter
on it.
Remove a pumpkin counter from Rider of the
Hollow: Exile target creature defending player
controls that didn't block Rider of the Hollow
this turn. Activate this ability only during combat
on your turn after blockers are declared.