Gideon does have moments where he charges into battle without proper planning, but none of them ever cause harm to him or anyone else, and its unclear whether he couldve been harmed in the first place
(Don't lay your noncreatures out at this point unless they're cards you are planning to play as soon as you have that much manafor example, you will generally cast a Mesa Unicorn on turn two, whereas [autocard]Gideon's Reproach[/autocard] isn't usually a turn-two play.) A good "mana curve" of creatures is crucial to a successful Sealed deck
Some Alchemy cards, for example, ask you to conjure other cards
Not only for providing coverage to a single color pair's innate shortcomings, but because Tarkirs three-color legends are complex powerhouses, packed with abilities that would only be possible if they required some effort to cast
So long as you have enough swamps, or Urborg, Tomb of Yawgmoth in play, Cabal Coffers offers insane value