Mazemind Tome

{t}, Add a Page counter to Mazemind Tome:
Scry 1.
{t}, Add two Page counters to Mazemind Tome:
Draw a card.
If there are five or more Page counters on this,
exile it and you gain 3 life. If you have completed
a dungeon, put this card on the bottom of your
library and gain 5 life instead.