Strahd, the Mage

Whenever you cast an instant or sorcery, exile it
with a book counter if its converted mana cost is
higher than any spell in exile with a book counter.
At the beginning of your upkeep, draw a card for
each card in exile you control with a book counter.

{3}{u}{b}{r} Exile Strahd, the Mage: Exile Strahd,
the Warrior and Strahd, the Devil from the battlefield, graveyard, or your hand, then meld them
into Strahd, the Ancient. Activate only as a sorcery.