Nagajj, The Pale Familiar

Venom Bite
When you have Darth Ophidia, The Pale Shadow
on your field, you can equip and unequip this
card to that card by paying {p/b}. When equipped,
the equipped card gains the ability Venom Strike
(When this card attacks, you can pay {p/b} to place a
-1/-1 counter on any Being or Creature card. If a card already has a -1/-1 counter(s) on it, double the
number of counters on it.)