In a Two-Headed Giant game, only creatures you control trigger the ability and get the bonus, but your teammate's attacking creatures are included in the calculation of those bonuses
Most significantly, spacecraft, alongside existing legendary vehicles, can now function as commanders in the Commander format, broadening deck-building possibilities and establishing new archetypes
This means editing the text of certain cards that to make them slightly less powerful
Out: Harmonize / In: Rishkars Expertise I went through a few different choices here, but I took a queue from another card in the deck, Lifestreamers Blessing
Venusaur's Vine Whip attack grabs hold of Charizard, and likely inspires the most expensive card in Brilliant Stars, which also features a similar battle
Full deck lists are not yet available, but set previews have confirmed one set of lead Commander cards, while the others are out in the wild and give us a great idea of how each deck will play, as do the descriptions on each of the boxes