It's true that a standalone spell that costs five and creates a 3/3 Flyer would be below the curve, being a prepare spell attached to another Creature is much more interesting
This is a little overcosted, but being a 4-mana noncreature spell and an Equipment has serious value in this set
Each constellation bonus is different
It reminds me of Wizards of the Coasts older Commander precons, which were often more like two or three half-decks in a trenchcoat (the idea being that players would play a few games, get a feel for which mechanics they liked and then start swapping in cards to emphasize that part of the deck)
Swords to Plowshares has always been the premier white removal spell and a reason to play white in the formats where its legal
Additionally, with I Trust You, you can look at the top two cards in your deck when she quests