First, lets talk about the three drops, before we get into finishes and languages
Both have seen minor spikes since Morcants reveal, but these could quickly escalate if Commander demand for the card continues
What set is City of Brass from
Aetherdrift Aetherdrift play boosters is a tough one, because just like a race, there's only one winner and if you have 10 guilds racing like this set, nine losers
Likewise, Serra Angel has fine synergy with Stasis (because Serra need not tap to attack), so it is another candidate for main deck or sideboard inclusion, especially if you wish to sideboard in to a more aggressive strategy for post-sideboard games
Unfortunately, red and white often want to play multiple cards in a turn (remember celebration?)