Cemetery Illuminator

What separates this from ordinary graveyard hate is that the exile is the fuel, not the point. The enter-or-attack trigger fires reactively at any graveyard, but every card it removes gets logged against this Spirit as a permission slip: match a card type, and you may cast a spell straight off your library, paying its cost as normal. That turns incidental graveyard interaction into a slow-building casting privilege, where the shape of what you exiled dictates what you can play. Exile a creature and you can cast creatures off the top; pick off an instant and the top card of your library becomes an instant you can jam at will. The one caveat worth noting is that the privilege is to cast a spell, so an exiled land does nothing to unlock lands off the top: this is a spellcasting engine, not a play-anything one. The persistent top-of-library visibility isn't a garnish but the engine's dashboard: you always know whether the extra cast is live before you commit mana to the turn. The once-per-turn limiter is the discipline that keeps a three-mana flyer from spiraling into unbounded card flow, capping it at one bonus spell per turn rather than an open chain. What the design rewards is a broad spread of exiled card types over a deep one: the wider the pile's variety, the more often the top of your library is something you're actually allowed to cast.