I got cards for creatures like Clawop, which looks like if the Pokmon Clauncher was a grass-type and Nimblis, which looks like a fluffy little evolution of Diancie
Additionally, surge foil borderless character cards can be found only in Collector Boosters
These sorts of Jund decks have been a staple in Standard for years, and its difficult for a deck full of small creatures that need to work together to win to beat a monstrous pile of removal and unbeatable creatures
Regardless of whether its Deathrite Shaman, Delver of Secrets or Ragavan, Nimble Pilferer, Daze makes one-mana threats into format destroyers
Aetherflux Reservoir might not be good in this deck, but I get the feeling that Sydris ability to make it a 4/4 lifelink when necessary means gaining the 10 life you need to be able to kill someone (or the 11 life you need to gain to be able to kill someone and not die) is doable and makes your life total just another resource the deck can use
The last way to win is by deck out