Kelmar, Archivist of the Dead

When Kelmar, Archivist of the Dead enters, Surveil X, where X is 2 plus the amount of creatures that died this turn.

Once per turn, you may put a page counter on target spell that entered your graveyard this turn.

You may cast spells from your graveyard as long as they have page counters on them. If a spell with a page counter on it would be put into your graveyard, exile it instead.