Sarevok's Tome 685 (Commander Legends: Battle for Baldur's Gate)

When this artifact enters, you take the initiative. {T}: Add {C}. If you have the initiative, add {C}{C} instead. {3}, {T}: Exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost. Activate only if you've completed a dungeon.

NM - $6.80
LP - $5.40
MP - $4.10
HP - $2.70
DMG - $1.50