They can generate a lot of value over the course of a game if they're not dealt with, and even when taken out swiftly, force your opponent to divert their attention away from their main goal: killing you
Graded Population Report: Arceus VSTAR #176 Visualize the distrbution of grades in the chart
The 2U mana cost is actually the same as the one blue one generic cost on the printed card - this is just how costs were formatted in Gamma
If You're Collecting for Investment Vintage: English cards are the safer bet for investment
This is just an incredible black enchantment, allowing you to pay up to 6 life a turn for some combination of mana generation, card draw, and board presence
Lastly, Midnight Snack and Night of the Sweets' Revenge fit well thematically, the Snack produces food tokens and the Revenge is undoubtedly one of the strongest payoffs you can include in any food deck, acting as a powerful win condition when you have the right setup and enough tokens