If you're using
Guiding Voice, you could use
Expanded Anatomy in the sideboard (a lesson that triggers Heroic as well as Magecraft). You could also go with
Reduce to Memory, just in case you needed something gone so bad that it was worth giving them the spirit, or maybe to replace a creature that got hit with
Pacifism.
Spirit Summoning/
Inkling Summoning are in colour, and technically adding them to an empty sideboard would only improve the deck, but there's probably not enough learning going on to justify so many lessons.
Apart from that,
Phalanx Leader provides a good Heroic effect (it often works out a bit ahead of
Leonin Lightscribe), and most creatures in this deck can be targeted by
Tethmos High Priest, so they might be worth considering as well.
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