The main requirement for putting Managorger Phoenix in your deck is that you need a lot of red mana symbols, but plenty of decks in Historic meet this requirement
Every Collector Booster contains 1 Foil-Etched card, 5 Borderless cards (1 of which may be Textured Foil), an Extended-Art card of rarity Rare or higher from one of the Commander Masters Commander Decks, and a total of 911 Traditional Foil cards to really make your decks shine
Outside of combo decks, Chainer decks have been displaced a little in higher brackets due to the sheer power and consistency of Commanders like Terra and Henzie, so getting new tech to build a more casual B2 or B3 deck is perfect
Yes, you can tap a treasure without sacrificing it
In addition to "as-fan," we have a statistic we look at called "as-played." This is like as-fan, but cards are weighted based on how much play we expect them to see