
Flying
Threshold — As long as there are seven or more cards in your graveyard, this creature gets +1/+1, is black, and has "{2}{B}, {T}: Destroy target blue creature."
Possessed Aven has 1 printing, first in Torment (2002). EDHREC ranks it #30,981 among Commander cards.
Cards that show up in the same decks on EDHREC.