
At the beginning of your upkeep, put a -1/-1 counter on each creature.
Harbinger of Night has 1 printing, first in Mirage (1996). EDHREC ranks it #14,390 among Commander cards. It appears most in Auntie Ool, Cursewretch decks (2,993 on EDHREC).
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.