Case of the Ransacked Lab (PPMKM-45P) - Murders at Karlov Manor Promos Foil

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.