Harbinger of Moonspire

X target permanents you control have Cumulative Upkeep {1} (At the beginning of your upkeep, if this permanent is on the battlefield, put an age counter on this permanent. Then you may pay (cost) for each age counter on it. If you don’t, sacrifice it.)
During the upkeep of a turn where five or more permanents were sacrificed, create a 10/10 white and black Ascendant of Moonspire creature token with indestructible and shadow.