Can I play its activated ability while it's in my graveyard, or only while it's on the battlefield
It's situational removal that can kill multiple pesky creatures and it's rather easy to pull off in practice because you get to untap the newly elected blockers and your opponent doesn't even need to attack you in order to pull this off
This can be an especially useful card in decks that already have an expendable board like Anhelo, The Painter or Lagomos, Hand of Hatred, or in spellslinger everything can be reused decks with commanders like Kess, Dissident mage
What makes Split Up so damned good is that you get the choice between blowing up tapped creatures or untapped creatures
Gaining two life is incredibly relevant as well, and anytime this gets flashed back by a Torrential Gearhulk, the game will have a devastating momentum swing
Adventures in the Forgotten Realms offers a host of Dragons, from legendary foes like Ebondeath to classics like the Red Dragon and the Queen of Dragons, Tiamat