When the winning team is determined, all other Duels taking place at that moment will be terminated
Mathing out the appropriate number of actions needed to take down certain opponent characters from time to time is just as important as playing a roster of your own characters who can lead to a big scoring round
There will be players of the video game who see Laezel or the Nautiloid Ship in MTG form who might find their interests piqued
A surprise part of green devotion decks (I know that sounds weird, but it can drop with a Storm the Festival or work with an Oath of Nissa) for a while, it provides another way to untap the various combo pieces like Nykthos, Shrine to Nyx in Pioneer and lesser entities like Nyx Lotus in Explorer
They're a resource that you can use to pay costs, like the ones offered by cards such as T-45 Power Armor
Sixth Edition was also a huge change in errata since a lot of older cards were changed to reflect Magics new rules