Indris, the Hydrostatic Surge is a big card that wants to storm off with Lightning Bolt, but Brawl is the main format for it to be your digital only commander
With Electrodominance, untapping with Niv becomes a lot easier
Fringe archetypes like four-color legends in Pioneer rely on Mana Confluence to be able to cast their spells on curve
A few removal spells handle it efficiently, but even if you mana to throw four power in front of it, theres a good chance you only got two or three toughness to block, leaving you a few damage down in the exchange
Wizards of the Coast knew exactly what it was doing by choosing these two in particular
But Nibelheim Aflame is cheaper, you can cast it twice thanks to flashback, and the second time you cast it, you discard your hand and you draw four cards