Epistolary Librarian [Warhammer 40,000]

Set: Warhammer 40,000 Type: Creature — Astartes Wizard Rarity: Rare Cost: {2}{W}{U} Veil of Time — Whenever Epistolary Librarian attacks, you may cast a spell with mana value X or less from your hand without paying its mana cost, where X is the number of attacking creatures. “Bolters? Chainswords? All fine weapons, however I wield a far more dangerous power.”