Supply is different
Each of those permanents attacks its owner if able, not necessarily the player you gained control of it from
If this card destroys an opponent's monster by battle: Inflict 300 damage to your opponent
Being able to play lands directly from your graveyard has empowered quite a few strategies in Magic, most notably Legacy Lands and Vintage Workshop, but you'll occasionally see it in Modern Golgari decks too
9 D - FORMATION Formation required Aster to use counters, which can always get a little messy, but the slower pace of the game helped it a lot
Modern: Heading into this article, I expected to write about how Sagas couldn't make it in Modern, and while this is probably still true, after researching all of the possibilities, I'm legitimately excited about playing Sagas with Starfield of Nyx