Unwitnessed

As an additional cost to cast this spell, sacrifice a creature.
Bonehunter —Target creature gains protection
from everything until end of turn. If you control
four or more creatures with Bonehunter, any
number of target creatures gain protection from
everything until end of turn.
"What awaits you in the dusk of the old world's
passing shall go . . . unwitnessed."
—Adjunct Tavore, to the Bonehunters