Two booster boxes will statistically clear most of the 86-card base
The Hybrid lands in particular are some of the best mana-fixing lands ever printed, and cost 2cT
The consistent trend is that you often have a ton of options that look like they should be similarly effective against similar strategies, but in practice having the exact right effect is matchup-defining
Quest Specific Escape from Dol Guldur, The Hunt for Gollum, A Journey to Rhosgobel, Across the Ettenmoors, A Storm on Cobas Haven all feature the Guarded keyword
Railway Brawler basically doubles your creatures power and toughness when they enter
A downside of building a Mutant cube is that, because the focus is so heavy on Evolutions, it is difficult to include the high HP, high damage EX cards of the current format