Song of Sepinestia

All creatures 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 {1} for each age counter on it. If
you don't, sacrifice it.)
Whenever a creature is sacrificed, put a soul counter on Song of Sepinestia.
Remove ten soul counters from Song of Sepinestia and sacrifice it: Search your library for
a card named Sepinestia, Soul's Host and add it
to your hand. Then, shuffle your library.