Unit — Ghost • ATK: 1 • HP: 1
Unstoppable but can't patrol (Can ignore patrollers when attacking.)Can't be sacrificed.Can't have more than 1 ATK.
Black Tech 0
"Can't be sacrificed" means you ignore it completely when choosing things to sacrifice. If you would sacrifice your "weakest" thing and this is it, then you sacrifice your second weakest thing, not sacrifice nothing. — Sirlin
Having a detector (or a Tower add-on) doesn't help against the unstoppable keywords. Even then, unstoppable attackers can ignore patrollers. — Sirlin