Predator Tiger

Predator Tiger
UnitTigerCost: 4ATK: 4 HP: 4
Predator Tiger is unstoppable by tech 0 units. (Can ignore tech 0 patrollers when attacking.)
Whenever Predator Tiger deals combat damage to a base, trash a worker at that base.
GreenFeral Tech II

Unstoppable Rulings
Having a detector (or a Tower add-on) doesn't help against the unstoppable keywords. Even then, unstoppable attackers can ignore patrollers. — Sirlin