They decided against making this set a Base set, and chose it as an Expansion instead, primarily due to the card series ending (before moving to GT), and the lack of significant personalities available to be used as MPs
Valley Floodcaller gives prowess and the ability to untap your rats in a flash
Main problem with it is that it enters play in the location furthest from Tony with 1 Doom on it, but also has always 1 Bounty on it by default, letting Tony engage it for free and get past its "Aloof" keyword
Goblin Trenches Good finishers for control decks that don't run any creatures can be hard to find, and Goblin Trenches filled that role at a time that nothing else could have
Umbreon drives the ceiling
To fill out one's collection, players should choose multiple of each pack as they play, so that it becomes easier to receive higher rarity chase cards