Baba Yaga's Mortar and Pestle

This has Indestructible if there are 10 cards in
exile with Page counters on them.
{t}: Put X -1/-1 counters on target creature or it's controller exiles the top card of their library. Put
a Page counter on the exiled card. X is equal to
the number of cards in exile with Page counters
on them.
Remove Y Page counters,{ut}: You gain Y life or
draw Y cards.