Case of the Ransacked Lab

Caso del laboratorio saqueado (Case of the Ransacked Lab) (es)

Enchantment - Case (CMC 3)
Instant and sorcery spells you cast cost less to cast.
To solve -- You've cast four or more instant and sorcery spells this turn. (If unsolved, solve at the beginning of your end step.)
Solved -- Whenever you cast an instant or sorcery spell, draw a card.