mtg sweep cards Magic The Gathering - Commander Legends - Battle for Baldur's Gate Until the end of your next turn What's up with "Sweep" :

This should let Vision do real work in Artifact-focused decks, Voltron lists, and even Control decks that want an evasive threat

Getting to do it more is just a bonus if you can play more princesses

Scion of the Ur-Dragon offers an easy, repeatable way for you to search out dragons from your deck and put them into your graveyard, which is already a good enough ability on its own for fueling your reanimator cards

If another attack trigger (such as from the mobilize ability) puts creatures onto the battlefield attacking, you can choose to order the triggered abilities so that those creatures enter before Stormbeacon Blade's ability resolves

Add on the potential to do all that for just two mana if you draw this off the top of your deck, and you've got a card that is likely to see itself in many black decks whether they focus on reanimation or not