MH3-72 Tamiyo Meets the Story Circle

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I - Until your next turn, whenever a creature attacks you or a planeswalker you control, it gets -2/-0 until end of turn.
II - Discard any number of cards, then investigate twice for each card discarded this way.
III - Shuffle up to three target cards from your graveyard into your library.