The problem with the original card (I believe it was later changed) was that having two in play was essentially auto-win
Today I have something special
This is because the Delver is part of a mega cycle. In other words, cards spread across multiple sets are used to tell the story here
When you can play it the Cloud brings awesome power offering a pretty good representation of a Mind Twist, an Armageddon, a Wrath of God or a Fireball, often a couple of those things and almost always far worse for your opponent than you
Since Cyclonic Rift appears in over 672,000 decks according to EDHREC, its safe to say theres a lot of demand
In the current era of color-pie expansion allowing black to kill enchantments, blue to exile artifacts, and the like, the number of colors or decks that can't find a removal spell is dropping fast