Quandrix students, help me count to five: Primo, the Unbounded, which I will absolutely be building, introducing the first-ever base-power-0 matters commander that builds big Fractal tokens when creatures with 0 base power deal combat damage Yavimaya Bloomsage, the only creature in the prepare cycle to feature a flat-out banned card in Channel, made ready by putting a +1/+1 counter on a creature that subsequently has power 7 or greater Owlin Spiralmancer, a powerful creature that copies the first X-cost spell you cast every turn (including on your opponents' turns) Nexus Mentality, a member of the highly exclusive club of cards that can move counters between nonland permanents (sadly, this doesn't let you rip counters away from Dark Depths) Turbulent Wilderness, the final land (for now) in the Turbulent cycle When it comes to blue-green, it can sometimes be difficult to build a deck with a cohesive theme that doesn't lean too hard on broad themes like +1/+1 counters or Lands Matter

The best equipment Commander is, like other questions of best card, a matter of personal preference
Outland Boar: reasonable uncommon in battlecruiser
I also appreciate that the two commanders, Tidus, Yuna's Guardian and Yuna, Grand Summoner are both powerful and support the new summon sagas from the set without being so oppressively strong that all deckbuilding choices warp around them