Paralytic Imp

Flying, First Strike
Paralytic Imp enters play with a Sap counter.
{0}, Remove a Sap counter from Paralytic Imp:
Tap target creature it has dealt combat damage
to and put a Sap counter on it. Creatures with
a Sap counter deal no combat damage while
tapped, and do not untap as normal during their
controller's untap step. That creature's controller
may pay {4} during their upkeep to remove
a Sap counter from it.