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
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
The ones included here are an Amber/Emerald deck and an Amethyst/Ruby deck
Orca, Siege Demon Nein bitte Orca
If you choose new targets, you must choose the same number of targets
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