Some previous legendary creatures have indeed banded together (not the mechanic, dont worry) to fight the Phyrexians: We also know that Phyrexian mana will be coming back on at least one card: Also, the effects of the invasion will be felt almost everywhere Magic has gone before, as reflected on the art for some returning dual lands: Timeline When will we know more
2024-09-20 A token that's a copy of Enduring Vitality won't return to the battlefield when its last ability resolves
(These guys really like MSE, even though it has some annoying rendering limitations.) However, if I get my importer working, I can just [let them] re-render their cards
However, some Sword and Shield booster boxes are only available on the secondary market
The most important part of this card though, and what sets it so high on this list, is the cant be countered clause