Curious Homunculus1U
Creature - Homunculus
t: Add C to your mana pool. 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 Curious Homunculus.
illus. Filip Burburan # 54/205
1/1
Voracious Reader
Creature - Eldrazi Homunculus
Prowess
Instant and Sorcery spells you cast cost 1 less to cast.
Good books make you savor each word.
illus. Filip Burburan # 54/205
3/4
First of all, I'm not saying this is playable, only pointing that it exists. Second, it's an uncommon, so some of you can dismiss this card
It seems pretty interesting. Cheap to deploy, gives colorless mana before transforming, and then we have a 3/4 with prowess that makes instants and sorceries (only yours) cheaper. Mentor would probably not be interested, baby jace is better in most cases, and a transformed homunculus don't affect gush, preordain of those non-colorless mana spells. However there are other decks that can play this to beat thorns and thalias, while keeping creatures at bay. Or even finishing with a reasonable 3/4 prowess.
Will it be played? Probably not, but it's new and interesting, and I cannot find any strictly superior card.