CASTING A SPELL
At any time during your turn, you may cast one spell, for your own benefit. The spells available for you to cast are the magic spells placed face up during setup.
To cast a spell, you must spend the number of full potion bottles depicted on the spell, then apply the effects of the spell. If your spell causes a wizard to enter Ravenskeep, your turn ends immediately (and you draw to fill your hand to 3 cards, as usual).
Spent potion bottles are returned to the game box.