Bok

Evocation Savant - Instant and sorcery spells you
cast cost {1} less to cast.
Potent Cantrip - When you cast an instant with a converted mana cost of two or less, it deals
damage equal to its converted mana cost to the creature or player it's targeting.
Overchannel - {3},{t}: The next sorcery spell you
cast that would deal damage to a target deals twice
that much damage instead.