Curious Homunculus // Voracious Reader

Curious HomunculusCreature — Homunculus

{T}: Add {C}. 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.

Voracious ReaderCreature — Eldrazi Homunculus

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) Instant and sorcery spells you cast cost {1} less to cast.