Ethmarch's Detainment Post

{t}: Add {w} or {r} to your mana pool.
Sacrifice a creature, {t}: put a +1/+1 counter on
target creature.
Sacrifice two creatures, {t}: Add {r}{r}{r} to your
mana pool.
"His rule was never questioned. Those that did ended
up spending the rest of their lives at one of his "Detainment Posts"..."