Due to its instant-speed, the biggest takeaway form Electrodominance is its ability to put any creature, enchantment, artifact, or otherwise onto the battlefield whenever you feel like it.
This card will most likely see play in Jeskai Modern decks that run Teferi. Imagine a scenario where you kill one of your opponent's threats with five toughness and put Teferi into play for free. Sounds pretty strong, doesn't it?
Grixis lists will also have it included in both the Standard and Modern formats, so it's definitely going to see a significant increase in price — think the range of $15 to $20 in the next couple of months.