Through Innistrad, each Game Day was held four weekends after release (X+4), but starting with Dark Ascension, they were pushed ahead to three weekends after release i.e., the weekend after the new set-specific Pro Tour which is where they continue to sit to this day
Getting a 3/1 haste for only 1 mana is strong, and 5 mana for the creature and the threaten effect is very similar to Zealous Conscript efficiency
Many of them functionally changed the card to make it do something we could write more easily
This set brings a particular focus to multi-Energy Pokmon, as well additional support for Darkness and Metal Pokmon
Cryptbreaker Zombie tribal wasnt very good when it received support in the original Innistrad block
Ulalek, Fused Atrocity seems to be the result of some unholy merging of the two, creating the five color MTG commander of the upcoming deck, Eldrazi Incursion