Sword of Feast and Famine An amazing economy card that both hand rips your opponent while doubling your mana income
Two damage to scry three and draw a land isn't exciting, but two mana to scry three and draw a Wedding Announcement, Brutal Cathar, or Fable of the Mirror-Breaker to play on the next turn is solid
Every time a player considers acting against the Group Slug deck, they will weigh the risk/reward of removing whatever is granting them treats, frequently they will find making the choice too taxing and just focus elsewhere
Gaining a level is a normal activated ability
That 40% gap between them is a signal: the distribution is skewed, and the mean is being pulled upward by outliers
They can be tutored with Open the Armory in an emergency, and enchant enemy creatures to take them out of combat