Horrific Altar

Sacrifice each creature that is used to crew
Horrific Altar. Whenever a creature dies put an
unholy counter on Horrific Altar.
If Horrific Altar leaves play remove all unholy
counters from it and create a 1/1 Horror Token
with Deathtouch for every counter removed.
Crew 4 (Tap any number of creatures you control
with total power 4 or more: This Vehicle becomes an artifact creature until end of turn.)