Im sure you wont mind losing 1 life (lets stay in the spirit of one mana for the sake or the article) to get rid of a Serra Ascendant
The second will be opened and the same process will occur although they will be passed on to the right
Supreme Verdict is fine, there is little to chose between it and Day of Judgement
Boros offers many of the same incentives as White Tokens - and in fact plays many of the same powerful cards
If not, should they be swapped
Looking at my cube, there is critical mass for: Goblins (R) Humans (all) Warriors (WBR) And, with some effort, other tribes could get critical mass running only cards that are cubeable by themselves, keeping the Poison effect to a minimum: Soldiers (W) Wizards (U) Shamans (RG) Vampires (B) I'm fine with dedicating 2-3 slots per color so each of these tribes have a Lord or some other linear effect as a nod to play them (Goblin Chieftain, Champion of the Parish, Chief of the Edge) but I don't want this cube to be mainly tribal, just have an extra layer of synergy that cares about the creature type line at a low opportunity cost
