You can think that you belong to Power Nine because Urbogg's bigger, Yarg, is a 9 card
This introduces a lot of randomization in a game where luck should be as mitigated as possible, so few players will voluntarily use them in a competitive format
Meanwhile, you are sweeping away utility creatures the other players are casting while advancing your gameplan to keep the battlefield clear for your big threats like Sun Titan
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
Like most Flesh and Blood cards, the value of Herald of Triumph Blue depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Monarch)