Spore Frog to fog every turn, Seal of Primordium to keep wiping out artifacts and enchantments, Pernicious Deed to keep board wiping, Plaguecrafter to keep them sacrificing creatures or Planeswalkers its strong stuff when it gets going
The middle triggered ability considers any turn and any player, so that burn player dealing out chunks of damage, or the black player that paid life to cast a spell, and that Colossal Dreadmaw that trampled over a 2/2
When you increase your deck size, you lower your chances of drawing your best cards
In a one-on-one comparison, its more advantageous to secure a guaranteed mythic than a rare, but for the price of 10 mythic packs, you could purchase 13 standard packs
The only remaining question is whether any of the higher-rarity cards are superior, and the answer for this booster is no
If the token is a copy of a noncreature card, it will still have haste, though that won't matter unless that token somehow becomes a creature