Caleb Widowgast, Prodigy

Keen Mind - You have no maximum hand size.
Instant and Sorcery spells cost {1} less to cast.

Find Familiar - {r}: Create Frumpkin, a
legendary 1/1 red Cat elemental creature token with
haste and "Exile Frumpkin at the beginnning of the
next end step."

Partner (You can have two commanders if both have
partner.)