If the opponent does not have the answer in hand already or draws into it in the next turn, the setback is so massive that it's an almost guaranteed loss for him
MDFCs and MDFC lands typically do not transform to the other side, though Spider-Man introduced cards that can be played on either side and have the capability to transform
Not only that, but regular in-game tournaments add a competitive edge that you might not expect from a solitaire game
Prowess vs Protection What if your prowess creature has protection from the spell you cast
This makes the best Lorcana item cards a fast way of responding to your opponents actions, as well as giving you lasting effects for the rest of the match that can strengthen your characters and boost the amount of lore you receive, among other effects
Don't buy the wildcards bundles unless you know exactly what you need, and unless you need it right now