Nidorans

Wither,
A deck may contain twice the amount the of Nidorans, than allowed by the format.
When a foe with a -1/-1 counter on it dies, you
may cast Nidorino or Nidorina, for its mutate
cost, targeting Nidorans, from your hand,
graveyard or library.
"It will torment its foes with poison spikes if it is threatened in any way."