I have called this for a future Commander Brew
We'll talk more about the B&R philosophy on Thursday, but the gist of the banning decision is as follows: mana bases with fetch lands and shock lands are very strong and make playing three or four colors too easy
The fate of the Slug is irrelevant
The Eldrazi Unbound Commander Masters Commander Deck set includes 1 ready-to-play Colorless deck of 100 Magic cards (2 Traditional Foil Legendary Creature cards, 98 nonfoil cards), a 2-card Collector Booster Sample Pack (contains 2 special treatment cards, with 1 Traditional Foil Common or Uncommon and 1 nonfoil or Traditional Foil Rare or Mythic Rare), 1 foil-etched Display Commander (a thick cardstock copy of the commander card with foil etched into the cards border and art), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 Life Wheel, 1 strategy insert, and 1 reference card.
(It can't be the target of spells or abilities your opponents control.) At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's blue