That said, Rampaging Ferocidon is now just another three-drop in a sea of good red three-drops, and you could just as easily end up wanting Goblin Rabblemaster, Goblin Chainwhirler, or no three-drops at all depending on how you build your red decks
since gravestorm is like normal storm, each copy resolves individually, so even discounting the ability to exile cards from our opponent's library, what we have is a card that forces our opponent to shuffle their library a whole bunch of times (once for each copy)
It doesn't matter is it sick or not
It also plays well with certain enters abilities that are much stronger when they happen at instant speed, like those that make opponents discard cards
2005: Umezawa's Jitte Like Urza's Block before it, Mirrodin block printed Artifact cards that were too strong, and over the next few years, Magic designers would ease up on the card type
The sorceries like Raphael's Technique have a huge upside if you sneak them in at an instant speed and at a lower cost