Fairly big update which pulls new cards from the last couple years' releases. Replacements are aimed at functional upgrades, overall Cube mana curve reduction and archetype solidification.
Green and black's roles outside of their various archetype bleeds are now focused on good rate playables and removal respectively.
Simic is now a "lands matter"/ramp adjacent color pair.
Gruul ramp's new payoffs now have immediate return on investment in the form of powerful ETBs. This is the same rationale as with the Dimir reanimator payoffs.