Curious Homunculus

: Add . Spend this mana only to cast an instant or sorcery spell.

At the beginning of your upkeep, if there are three or more instant and/or sorcery cards in your graveyard, transform this creature.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Instant and sorcery spells you cast cost less to cast.