Escort Duty

You cannot search your library for Escort Duty
unless there are three or more Missions in your
exile.
Add Doretta, The Drilldozer to your hand from
anywhere and play it. Dwarf creatures you
control gain {t}: remove three -0/-1 counters
from Doretta, The Drilldozer.
If Doretta, The Drilldozer is destroyed, exile
Escort Duty.
The Heartstone almost seems one with Hoxxes.