Philip, Gaia Library

Whenever an opponent casts a permanent spell, investigate (Create a colorless Clue artifact token
with "{2}, Sacrifice this artifact: Draw a card.")
{2}, Sacrifice a Clue: You gain 3 life.
{3}, Sacrifice two Clues: Shuffle up to 4 cards
from your graveyard into your library. Draw a
card.
{4}, Sacrifice three Clues: Search your library for
a card and put that card into your hand. Then
shuffle your library.