Ananiel, Singer of Dark Songs

Flying, Indestructible
If there are ten or more creature cards total in all graveyards, this spell costs {6} less to cast.
At the beginning of your upkeep, put a despair
counter on Ananiel, Singer of Dark Songs, then
each player exiles X permanents they control
and/or cards from their hand, where X is the
number of despair counters on Ananiel,
Singer of Dark Songs.