Rescue Cat is not happy with the meta that shunned him

[Lonk]

Vengeful Cat
Level 4
EARTH
Beast/Effect
ATK/300 DEF/100

This card cannot be destroyed by the effects of Spells, Traps or Monsters. During the turn your opponent summoned 2 or more monsters or controls a Synchro Monster, you can tribute this card to destroy all monsters your opponent controls. This card's effect cannot be negated. This card's effect cannot be used while control 2 or more monsters of different names or while you control a Synchro Monster.

Broken, OP'ed or Balanced?