Emrakul, She Who Corrupts is a 9th Level Spellcaster, has a Spell Attack Modifier of +20, A Spell Save DC of 35 and knows the following spells;
1st: Bane, Charm Person, Entangle, False Life, Fog Cloud, Hideous Laughter, Inflict Wounds, Magic Missile, Sleep.
2nd: Blindness/Deafness, Detect Thoughts, Enthrall, Hold Person, Moonbeam, Ray of Enfeeblement, Silence, Suggestion.
3rd: Bestow Curse, Clairvoyance, Counterspell, Dispel magic, Fear, Hypnotic pattern.
4th: Arcane Eye, Banishment, Black Tentacles, Blight, Compulsion, Confusion, Dominate Beast, Phantasma Killer, Polymorph.
5th: Anti-Life Shell, Cloudkill, Contact Other Plane, Contagion, Dominate Person, Geas, Hold Monster, Modify Memory, Planar Binding, Telekinesis, Wall of Force.
6th: Disintegrate, Irresistable Dance, Mass Suggestion.
7th: Forcecage, Reverse Gravity.
8th: Animal Shapes, Antipathy/Sympathy, Dominate Monster, Feeblemind, Maze, Mind Blank, Power Word: Stun.
9th: Foresight, Meteor Swarm, Power Word: Kill, True Polymorph, Weird

Emerakul, She Who Corrupts always casts spells with a 9th Level Spell Slot and has 15 total spell slots.