Ive been thinking about finding room for Silverback Elder, which seems just incredible in this deck
Though 16 is typically considered a high number of non-inkable cards, nine of them are songs so they're less likely to get stuck in your hand
If youre looking to beat up that one guy who brings in an over-powered Commander deck to the newbies table, adding in an Exquisite Blood creates an infinite damage combo with Sanguine Bond (albeit a 10 mana, 2-card combo, but a combo nonetheless)
From there, youll want to be finding ways to either beef them up or make them evasive, like Harbin, Vanguard Aviator
Oko, Thief of Crowns Don't let Oko's first and last ability fool you
Feast of Succession probably does pretty well around Bracket 2 and in mid-power Cubes, but it costs a little too much to truly excite